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Pr-eheated oven to 275 deg F .
Lay two extra-large pieces of aluminum foil on the 9 x 13-inch baking dish (or baking dish that would fit pork). Place the ham in the center of the foil on a baking dish (you want enough tin foil so you can cover it all), cut side down.
Bake at 275 degrees Fahrenheit for 2.5-3 hours, until the internal temperature reaches 140 degrees Fahrenheit (approximately 3 hours total is suitable for 10-pound pork, you may need more or less depending on the size of the ham).
In a small bowl, combine honey, butter, brown sugar, garlic, mustard and pepper. Bring to a boil over a medium-high heat, then reduce the heat to medium and boil for 2 minutes.
Remove the tin and brush with half the glaze layer. Raise the oven temperature to 450 and bake for 10-15 minutes, until the glaze is nice and sticky and begins to turn brown.
Combine the remaining glaze and pork juices in a frying pan and bring to a boil over a low heat. It is thickened if desired with a cornstarch slurry (equal parts cornstarch and water, mixed and then added to the boiling juices).