Ingredients

1. Prepare oven and roasting pan: 

   Preheat oven to 350°F. Let ham stand at room temperature 30 minutes. Line a roasting pan with aluminum foil; top with an ovenproof rack.

2. Make glaze: 

   For glaze, stir together marmalade, honey, vinegar, thyme, ginger, salt, and pepper in a small bowl.

3. Add glaze to ham: 

   Place ham on rack in prepared pan; brush 2/3 cup of the glaze over ham and in between slices.

4. Bake ham: 

   Turn ham fat side down, with bone running parallel to bottom of pan, and pour 3 cups water into pan. Cover tightly with foil. Bake in preheated oven 1 1/2 hours.

5. Baste ham: 

   Remove from oven; remove and discard foil. Baste with pan drippings; brush 1/3 cup of the glaze over ham and in between slices.

6. Continue to bake and baste ham: 

   Return to oven, and bake at 350°F until a thermometer inserted in thickest portion of ham registers 140°F, 30 to 40 minutes, basting ham with pan drippings and brushing with 1/3 cup of the glaze about every 10 minutes.

7. Garnish and serve: 

   Remove ham from oven. Carefully transfer it to a serving platter. Garnish with fresh thyme sprigs, sliced oranges, halved tangerines, and kumquats, if desired.