Step 1

Preheat your oven to 350 degrees F.

Step 2

In a small bowl, mix together the brown sugar, yellow mustard, and enough water to make a syrup.

Step 3

Place the ham fat side facing up in a plastic roasting bag.

Step 4

Spoon the glaze over the top of the ham, secure the bag, and roast the ham until it reaches at least 130 degrees.

Step 5

Remove the ham from the bag, pour the ham drippings into the roasting pan and remove the bag.

Step 6

Place the roasting pan with pan drippings on a stovetop and set to medium heat.

Step 7

Add 2 cups of potato water to the roasting pan.

Step 8

Mix together 1 tablespoon cornstarch with a small amount of water to create a slurry and whisk it into the roasting pan.

Step 9

Cook at a simmer, whisking continuously until the sauce starts to thicken. Adding more cornstarch slurry as needed.

Step 10

If needed, season with additional salt and pepper, remove from heat, transfer to a gravy boat and enjoy your ham gravy