The regional table / Vermont
Vermont Maple Baked Beans
Vermont measured its own maple in 1914 and found it was making seven million pounds of sugar against four hundred thousand gallons of syrup. The sweetener in a Vermont kitchen was a hard cake you shaved with a knife, and that is the fact this dish is built on.
Bulletin No. 21 of the Vermont Department of Agriculture, dated March 1915 and titled How Vermont Maple Sugar Is Made, is the closest thing the state has to an official statement of what to do with its own crop. It prints twenty-odd recipes under the heading Recipes for Using Maple Sweets in Cooking, and every one of them is sweet: maple rolls, fritters served with warm maple sap syrup, baked apples, a Maple Apple Pie, gingerbread, ice cream, fondant, sugar on snow. There is not a bean anywhere in it. There is not a bean in the 1899 Dewey Cook Book out of Montpelier either, which runs to a Spanish bean soup made with black turtle beans and nothing else in the legume line. So let us be honest at the start: the maple bean pot is not a dish I can hand you out of an old document, and the quantities below were worked out for this page.
What the documents do give is the sweetener, in detail, and that turns out to be the whole argument. The same 1915 bulletin reports the census the Vermont Legislature ordered in 1912 and the listers carried out in the spring of 1914, with eleven of the state's 246 towns failing to report: 7,117,671 pounds of maple sugar, 433,750 and a half gallons of maple syrup, 5,190,461 trees tapped and 4,741,915 more standing untapped. Greensboro led the state with 235,850 pounds of sugar, then Cambridge and Albany; Orleans county made the most of any county. Sugar outweighed syrup by an order of magnitude, because sugar kept and travelled and syrup did not, and because under the McKinley tariff a bounty of two cents a pound was paid on maple sugar testing 90 degrees or better by the polariscope, one cent between 80 and 90, and more than ten thousand Vermont farmers took it. A bean pot in a Vermont farm kitchen in 1914 was sweetened from a cake on the shelf.
Why this version works
Dark syrup, by the grade the law actually uses now. The United States Standards for Grades of Maple Syrup that took effect on 2 March 2015 abolished the old letter grades. Grade A now has four colour-and-flavour classes set by light transmittance at 560 nanometres: Golden with Delicate taste above 75.0 percent, Amber with Rich taste at 50.0 to 74.9, Dark with Robust taste at 25.0 to 49.9, and Very Dark with Strong taste below 25.0. The standard defines Robust as a stronger maple taste than the lighter colours and Strong as stronger still. For beans you want Dark or Very Dark; Golden vanishes entirely.
Half the syrup at the start, half in the last hour. The flavour of maple is not in the sugar. It is made in the pan during boiling and it is volatile, which is why every sugarmaker's literature warns against over-boiling a finished batch. Six hours at 300°F strips most of it out of anything you put in at the beginning. Splitting the syrup gives you the colour and the body from the long bake and the aroma from the last sixty minutes, and the difference is not subtle.
Salt pork scored and buried, and the liquid never allowed to fall below the beans. Fat rendering slowly through the pot is what carries maple's flavour compounds into the beans, since they are more at home in fat than in water. Scoring the rind gives the fat a way out over six hours rather than all at once. Skins that surface into dry oven air go leathery and do not come back, so the pot is topped up with boiling water every time the level reaches the top layer of beans.
Maple is sucrose and almost nothing else, which is why it behaves differently in a long bake. USDA's FoodData Central puts maple syrup at 58.32 grams of sucrose and 0.52 grams of fructose per 100 grams; molasses at the same weight is 29.4 grams of sucrose against 12.79 of fructose, with the rest of its sugar already inverted. Maple also carries 102 milligrams of calcium to molasses's 205, 212 milligrams of potassium to molasses's 1,464, and 0.11 milligrams of iron to molasses's 4.72. Practically, that means a maple pot browns from caramelising sucrose rather than from a mineral-heavy invert syrup, and the finished beans stay red-brown and taste of the tree instead of the refinery.