STEP 1

Preheat oven to 325°F with a rack in the lower third. Wrap ham tightly, with fat-cap-side up, with parchment-lined foil. Place on a rimmed baking sheet or in a roasting pan. Transfer ham to oven and bake 1 hour.

STEP 2

In a small bowl, mix together brown sugar and Cognac. Carefully peel back parchment-lined foil, leaving foil under ham to catch juices. Brush some glaze all over ham, making sure to thoroughly coat the top. Continue baking uncovered, basting with more glaze every 15 minutes, until heated through and a caramelized crust has formed, 45 minutes to 1 hour more. Brush with remaining glaze; let cool slightly.

STEP 3

Transfer ham to a cutting board or serving platter and serve warm with juices and your favorite mustard.