Skillet & Sage

The regional table / Oregon

Marionberry Pie

Published October 10, 2026 · Oregon

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Almost no American dish has a birth certificate; this one has a circular number, a county, a breeding programme and a taste panel that ate the pies.

The berry comes first, because it is a bred object with a paper trail. In February 1957 the Agricultural Experiment Station at Oregon State College published Circular of Information 571, "The Marion Blackberry", by George F. Waldo, who signs himself in the footnote as horticulturist, U.S. Department of Agriculture. It opens by saying that Marion "is a new blackberry that shows promise of meeting some needs of Oregon's small fruit industry" not met by the two varieties then grown most, Thornless Evergreen and Boysen. The origin section is short and exact: the berry comes out of the cooperative breeding programme of the U.S. Department of Agriculture and the Oregon Agricultural Experiment Station at Corvallis, in which, Waldo writes, "we have tried to incorporate the good flavor of the native trailing blackberry, Rubus macropetalus Dougl." — done here through one of its parents, the Chehalem. Marion is "the result of a cross, Chehalem X Olallie", selected in 1948 as U.S.-Oregon 928 and "tested under this number until its release as Marion in 1956". The year the cross was made is the one number the scan destroys. And the name is a place, not a person: "The name Marion has been given because this blackberry has been most extensively tested in Marion County and is apparently well adapted to that area. At present Marion County leads in the production of trailing blackberries." The press picked it up from the circular rather than from a farm: the Medford Mail Tribune of 7 March 1957 ran a notice out of Corvallis that "A circular describing and telling how to grow the new Marion blackberry has been published by the Oregon State college agricultural experiment station", written by Waldo, "USDA horticulturist at OSC who developed the Marion". The compressed one-word spelling took years to show up in print; the earliest I can find in the Oregon newspaper archive is a classified advertisement in the Roseburg News-Review of 22 April 1963, under Seeds and Nursery Stock: "MARIONBERRY and Nectarberry plants."

The pie has a document too, and it is from the same campus in the same year. In November 1957 the Federal Cooperative Extension Service at Oregon State College issued EC 636, "Make Mine Pie", by Ruth Klippstein, and its fruit-pie section is the whole of this recipe in two sentences: "Three cups of prepared fruit are usually enough for a 9-inch pie", and "Tapioca, cornstarch, or flour may be used as thickening agents, with 2 to 3 tablespoons per pie as a good average. Extremely juicy fruits may require more." A marionberry is the extremely juicy case — the USDA figure for raw blackberries is 88.2 percent water — so the thickener below is scaled up, and the pie is filled fuller than three cups because that is what people now expect of a berry pie. Everything else in the method is the bulletin's: start the oven hot to set the base, dust the bottom crust with flour and sugar before the fruit goes in, and shield the rim with foil if it colours first. Circular 571 even records the pies. The Food Technology Department, Waldo writes, "has baked blackberry varieties, which have been eaten and rated by taste-test panels", and "Berries of Marion were rated best in 1954 and among the best in 1956". The quantities here were worked out for this page, from those two documents.

Why this version works

Hot first, then moderate. The bulletin's answer to a soggy bottom crust is to "start the baking at 450 °F. to set the crust", and the first ten minutes are the only chance you get: once the fruit has released its juice, a pastry base that has not already begun to set will absorb it. The second remedy it offers is mechanical rather than thermal — "sprinkle a flour and sugar mixture on the bottom crust before adding the filling" — and doing both costs nothing. After that the heat comes down, because what the rest of the bake is for is boiling the filling, and starch that never boils never thickens.

A tart berry wants its own sugar, not more of it. Raw blackberries carry 4.88 grams of total sugars per hundred grams, so a pound and a half of fruit brings about 33 grams of sugar of its own against the 150 grams the recipe adds. Almost all the sweetness in a berry pie is added sweetness, which means the quantity is a decision rather than a given. Three quarters of a cup leaves the fruit tasting of itself and keeps the acid that makes you want a second slice; a full cup, which many recipes use, turns Marion into generic sweet blackberry.

The seeds are a measured property of this variety. Circular 571 prints a table of seed weight by variety in milligrams per seed, and the spread explains a great deal about which blackberry pies are pleasant to eat: Chehalem 1.58, Cascade 2.08, Logan 2.16, Marion 2.27, Himalaya 2.63, Young 3.67, Evergreen 3.74, Boysen 3.92. A Marion seed is a little over half the weight of a Boysen one. That is why this pie is made with whole berries and never strained — the variety was selected to be eaten seeds and all.

The fruit is 88 percent water and the starch has to carry all of it. The USDA records put raw blackberries at 88.2 percent water and frozen unsweetened ones at 82.2 percent, which is the whole engineering problem of a berry pie: a pound and a half of fruit is carrying most of a pint of liquid that only appears once the oven has broken the cells. EC 636's average of two to three tablespoons of thickener for a three-cup pie works out to about a tablespoon a cup, and the bulletin's own escape clause — extremely juicy fruits may require more — is the licence for the five tablespoons here. Under-thicken and the slice collapses; over-thicken and you get jam with a crust.

Ingredient notes

The pastry: EC 636 prints a "standard pastry recipe" of 2 cups flour, 1 teaspoon salt and 4 to 6 tablespoons water, with the shortening quantity sitting in the one spot the scan cannot read. The crust below is butter rather than shortening and scaled up to two and a half cups of flour, because a fruit pie this wet wants a lid that can take it. Keep everything cold, stop mixing while the butter is still in flakes, and rest the dough before it is rolled.

The berries: a pound and a half, about five cups. Circular 571 tabulates three seasons of harvest dates and they are tight: 15 July to 24 August in 1954, 22 July to 23 August in 1955, and 12 July to 6 August in 1956. That is a four to six week window in the middle of summer, which is why most marionberry pie is made from frozen fruit. Frozen is not a compromise here: the same circular reports seven seasons of frozen-pack panels in which Marion was "rated superior to Boysen" every time. Do not thaw it; toss it frozen with the sugar and starch and accept a longer bake.

The thickener: cornstarch, five tablespoons, which is the bulletin's list and the firmest of its three options. Quick-cooking tapioca works and leaves the filling glossier and slightly looser; flour works and makes it cloudy and dull, which is why it fell out of use. Whichever you use, mix it with the sugar before it meets the fruit, or it will clump in the juice and bake into pale lumps.

The sugar and the acid: three quarters of a cup of granulated sugar and a tablespoon of lemon juice. The lemon is not for flavour you can identify; it is there because acid helps the starch and the pectin behave and keeps the colour from going dull brown. Do not add more sugar to a batch of frozen berries thinking they are sourer than fresh: they are not, they are simply wetter once thawed.

Step by step

  1. Make the pastry and rest it cold. Rub or cut the cold butter into the flour, salt and sugar until the biggest pieces are the size of peas, then bring it together with 6 to 8 tablespoons of ice water, adding it a tablespoon at a time and stopping as soon as it holds. Divide it in two, flatten each piece into a disc, wrap and refrigerate at least 1 hour. The flakes of butter you can still see are the layers you want later.
  2. Mix the filling and let it stand. Stir the sugar, cornstarch and salt together in a large bowl, add the berries and the lemon juice and fold until nothing dry is left. Let it stand 15 minutes. Fresh fruit will give up some juice in that time and the starch will begin to take it up, which is the difference between thickening in the oven and leaking in the oven.
  3. Line the tin and dust the base. Roll the first disc to about 12 inches and line a 9-inch pie tin, leaving the overhang. Sprinkle the base with the tablespoon each of flour and sugar — the bulletin's second defence against a wet bottom crust — and put it in the fridge while you roll the lid.
  4. Fill, lid and vent. Tip in the filling and level it without pressing. Lay the second round over the top, trim both crusts to about half an inch beyond the rim, fold them under together and crimp. Cut four or five generous vents in the lid: this filling has to boil and the steam needs somewhere to go. Chill the assembled pie 15 minutes, and heat the oven to 450 °F with a baking sheet on the lower rack.
  5. Bake hot, then moderate, on the sheet. Brush the lid with cream and sprinkle it with sugar, set the pie on the hot sheet and bake 10 minutes at 450 °F. Drop the oven to 375 °F and bake another 45 to 55 minutes — longer, up to 70, if the fruit went in frozen. If the rim colours first, do what EC 636 says and crimp a 2-inch strip of foil round it.
  6. Judge it by the vents, not the clock. It is done when juice is bubbling up through the vents thickly and slowly, in heavy glossy blips rather than thin running liquid. Thin bubbles mean the starch has not come to the boil in the middle of the pie, and no amount of cooling will fix that.
  7. Cool it completely. Four hours on a rack, minimum, and overnight is better. Cornstarch sets as it cools, not while it is hot, and a marionberry pie cut warm will run across the plate no matter how well it was made. Serve it at room temperature.
A runny pie has one of two causes and both are diagnosable from the slice. If the filling is thin and pale, the starch never boiled: the pie came out while the vents were still running clear, or the oven stayed low the whole way. There is no rescue after cooling, but the same pie put back into a 375 °F oven for 20 minutes while still warm can still be saved. If the filling is thin and dark and tastes cooked, there was simply not enough starch for the fruit — likely frozen berries, which carry more free water than their weight suggests. Next time add a tablespoon. For the far commoner failure, a wet bottom crust, the fix is prevention in this order: the hot first ten minutes, the flour and sugar dusting, and a preheated baking sheet under the tin, which puts heat into the base where it is needed. If the rim burns before the middle is done, foil the edge; if the lid is pale and the filling is bubbling properly, move the pie up a rack for the last five minutes rather than extending the bake.

Storage and make-ahead

The pie keeps 2 days at room temperature under a loose cover and 4 days refrigerated, but the crust softens from the second day on. Reheat whole or in slices in a 350 °F oven for 10 to 15 minutes, which crisps the pastry again and does the filling no harm, and never in a microwave, which turns the base to paste in thirty seconds.

Both parts freeze, and unbaked is better than baked. Assemble the pie, freeze it solid unbaked and wrapped, and bake it from frozen with 20 to 25 minutes added to the second stage. Baked pie freezes for 3 months and comes back a little looser in the filling. Loose berries freeze best of all on a tray before they are bagged, which is also how the frozen-pack trade handled the fruit when the Food Technology Department was testing Marion against Boysen season after season.

What to serve with it

Unsweetened whipped cream or plain vanilla ice cream, and not much of either. The filling is already carrying three quarters of a cup of sugar and the point of the variety is the aromatic, slightly sour blackberry flavour the breeding programme set out to capture from the native trailing berry; a sweet sauce buries it. A wedge of sharp cheddar beside the slice is the old northern pie habit and it works here better than it has any right to.

To drink, coffee, or black tea with nothing in it. If you want wine, a dry sparkling one cuts the sugar where a sweet dessert wine simply adds to it.

From the recipe box / Oregon

Marionberry Pie

A double-crust pie of the blackberry Oregon State released in 1956 and named for the county that grew it, thickened for a fruit that is 88 percent water and started hot to set the base — built on two Corvallis documents printed nine months apart.

Prep
40 min
Cook
1 hr 5 min
Total
7 hr
Serves
8
Calories
481 per serving

Ingredients

Scale

Instructions

  1. Cut the butter into the flour, salt and pastry sugar, bring it together with ice water, divide in two and refrigerate at least 1 hour.
  2. Mix the filling sugar, cornstarch and salt, fold in the berries and lemon juice, and let it stand 15 minutes.
  3. Roll out one disc, line a 9-inch tin and dust the base with the tablespoon each of flour and sugar.
  4. Fill, lay on the lid, trim and crimp the edges, cut four or five vents, and chill 15 minutes while the oven heats to 450 °F with a baking sheet inside.
  5. Brush the lid with cream, sprinkle with sugar and bake 10 minutes at 450 °F, then 45 to 55 minutes at 375 °F, foiling the rim if it browns early.
  6. Take it out when the juice is bubbling through the vents in slow heavy blips rather than thin running liquid.
  7. Cool the pie on a rack at least 4 hours, and overnight if you can, before cutting it.

Nutrition

Fat24 g (15 g saturated)
Sodium290 mg
Protein5 g
Servingone eighth of a 9-inch pie
Calories481
Cholesterol61 mg
Carbohydrates63 g (25 g sugar, 6 g fiber)

Nutrition is an estimate calculated from the listed ingredients and is provided as a courtesy, not as dietary advice.

Questions readers ask

Fresh or frozen?

Frozen, most of the year, without apology. The fresh season in the circular's three years of records ran from the second or third week of July to somewhere between 6 and 24 August, which is a few weeks of the year in one state. Frozen marionberries are a major commercial pack and were tested as such from 1950 onward at Oregon State. Use them unthawed, mixed straight into the sugar and starch, and add 15 to 20 minutes to the bake.

What exactly is a marionberry?

A named blackberry cultivar, not a wild species and not a regional nickname. Circular of Information 571 gives the pedigree as a cross of Chehalem and Olallie, selected in 1948 under the number U.S.-Oregon 928 and released as Marion in 1956 by the joint breeding programme of the USDA and the Oregon Agricultural Experiment Station. It was named for Marion County, where it had been tested most and which, the circular notes, then led the state in trailing blackberry production.

Can I use ordinary blackberries?

Yes, and the pie will be good but not the same. The circular's own comparisons are the guide: against Boysen, Marion was rated superior in frozen-pack panels in each of seven seasons, and its seeds weigh 2.27 milligrams against Boysen's 3.92 and Thornless Evergreen's 3.74. A supermarket blackberry is usually a thornless Evergreen type — bigger, blander, seedier — so expect to taste less and chew more. Keep the sugar and the starch the same.

Why does my berry pie always leak?

Because the filling never boiled, which is a different fault from not having enough starch. Cornstarch has to reach a boil to thicken, and in the middle of a cold pie that takes most of an hour; the vents tell you when it happens, by going from thin running juice to slow heavy bubbles. The other half of the answer is cooling. The gel sets as it comes down to room temperature, so a pie cut after an hour was never going to hold, whatever was in it.