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1
Preheat the oven to 450.
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2
Cut off the ham skin, leaving a thick layer of fat.
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3
Lightly score the fat in a diamond pattern.
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4
Arrange the pineapple rings in a roasting pan.
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5
Add the onions, bay leaves, Marsala, Riesling, water and nutmeg.
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6
Set the ham on top, fat side up.
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7
Cover with parchment paper, then tightly cover the pan with foil.
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8
Bake the ham for 40 minutes.
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9
Turn the oven to 325 and bake for 2 hours and 30 minutes longer, or until an instant-read thermometer inserted in the thickest part without touching the bone registers 120.
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10
Meanwhile, in a food processor, puree the chopped pineapple, then blend with the mustards.
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11
Remove the ham from the oven.
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12
Turn the oven to 400.
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13
Spread the pineapple mustard all over the ham and arrange the jalapeno rings on top in even rows.
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14
Bake the ham for 15 minutes, or until nicely browned.
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15
Transfer to a cutting board and let rest for 20 minutes.
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16
Meanwhile, strain the pan juices into a saucepan and boil over high heat until reduced to 3 cups, about 20 minutes.
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17
Skim off the fat and pour the juices into a warmed gravy boat.
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18
Carve the ham in thin slices and serve with the pan juices.