Holiday Ham with Riesling and Mustard

INGREDIENTS

• 1 14–16-pound whole cured, smoked bone-in ham
• 2 cups sweet (Auslese) Riesling, divided
• 2 tablespoons (1/4 stick) unsalted butter
• 1/4 cup finely chopped shallots
• 3 sprigs thyme plus 2 teaspoons fresh thyme leaves
• 1/2 cup whole grain mustard
• 1 tablespoon honey
• 1/2 teaspoon freshly ground black pepper
• Small pinch of kosher salt