Step 1

Preheat the oven to 325 degrees F. Let the ham sit at room temperature for 30 minutes and trim off any skin. If your ham is not a spiral-cut ham, use a sharp paring knife to score through the fat in a diagonal crosshatch pattern without cutting through to the meat.

Step 2

Place the ham, flat side down, on a roasting rack in a roasting pan. Pour 1 cup water into the pan. Bake until a thermometer inserted into the thickest part of the ham registers 130 degrees F, about 2 hours 30 minutes (about 15 minutes per pound—reduce the time to 10 minutes per pound for a spiral-cut ham).

Step 3

Meanwhile, make the glaze: Whisk the brown sugar, maple syrup, soy sauce, orange zest and juice, Dijon, vinegar, cinnamon, cloves, onion powder and a few grinds of black pepper in a medium saucepan until smooth. Bring to a boil over medium-high heat, whisking occasionally, then reduce the heat to low and simmer until the glaze has thickened and reduced by half (you should have 1 cup glaze), 20 to 25 minutes. Set aside until the ham is ready.

Step 4

Increase the oven temperature to 425 degrees F. Brush half of the glaze over the ham. If the water in the bottom of the pan has evaporated, add 1 cup water. Return the ham to the oven and roast for 30 minutes, brushing with the remaining glaze every 10 minutes (two more times) before returning to the oven.

Step 5

Let the ham cool for 15 minutes before thinly slicing.