The regional table / Vermont
Vermont Maple-Glazed Ham
The oldest Vermont ham recipe I could find sweetens with cider and white sugar and never mentions maple once. That absence is worth knowing before you glaze anything, because it tells you maple is here on its merits and not on a tradition.
The Dewey Cook Book, compiled by the Women of the Auxiliary to the Young Men's Christian Association of Montpelier, Vermont, and printed by the Argus and Patriot Press in 1899, has a recipe called simply Boiled Ham. Wash a ten pound ham and soak it overnight in enough water to cover with a cup of strong vinegar added; in the morning put it in just enough boiling water to cover, add one quart of sweet cider, simmer gently for three hours; then remove the skin, set it fat side up in a baking pan, stick in a dozen cloves, baste with sugar and cider and bake until a nice brown. It is a maple state's community cookbook and the ham is glazed with cane sugar. The same book's maple recipes are all sweets — parfait, fondant, sugar candy, a maple cream.
The federal farm literature says the same thing from the other direction. Farmers' Bulletin 1186, Pork on the Farm: Killing, Curing, and Canning, in the 1921 revision, gives its Formula No. 1 for each 100 pounds of meat as 8 pounds of salt, 2 and a half pounds of molasses or sirup made from sugar and applied hot, 2 ounces of saltpeter, 3 ounces of black pepper and 2 ounces of red pepper. Maple does appear in that bulletin, but in the smokehouse rather than the cure: green hickory or maple wood, it says, is the best fuel for smoking, hard wood being preferable to soft, and resinous woods never to be used. So the honest account is that maple came to the ham late and from the glaze end, and the recipe below treats it as a finishing sugar with a job to do rather than as folklore.
Why this version works
Gentle first, fierce last. The ham is already cooked; the only job in the first two hours is to bring the middle up without drying the outside, which is what a covered pan at 325°F over an inch of cider does. The glaze then needs real heat to set — 425°F for the last half hour, in three coats ten minutes apart, so each one dries to a lacquer before the next goes on.
Vinegar and mustard against a cup of sugar. A cup of maple syrup is about 190 grams of sugar going onto one joint of meat. Three tablespoons of cider vinegar and two of mustard are not a flourish; they are the only thing standing between a glazed ham and a dessert. The 1899 Montpelier recipe reaches for the same balance from a different direction, soaking its ham overnight in water with a cup of strong vinegar.
The syrup is reduced before it ever touches the ham. Maple syrup at legal density is about a third water — the United States Standards for Grades of Maple Syrup require finished syrup to be not less than 66 percent solids by weight and not more than 68.9. Poured straight onto a hot ham, that water runs off into the pan, taking the sugar with it, and what burns on the pan floor is the glaze you meant to eat. Ten minutes of simmering with vinegar and mustard takes a cup down to two-thirds and turns it into something that clings.
Very Dark syrup, because the sweetness has to carry over cured pork. Under the grade standards that took effect on 2 March 2015, Grade A splits into four colour-and-flavour classes: Golden with Delicate Taste, Amber with Rich Taste, Dark with Robust Taste, and Very Dark with Strong Taste. The standard defines Robust as a stronger maple taste than the lighter colours and Strong as a maple taste stronger than robust. Against a salty, smoked, eight-pound ham, anything lighter than Dark is a waste of money.