In a medium mixing bowl, whisk together ½ cup apple juice, 1 cup packed brown sugar, 2 tablespoons coarse ground mustard and 2 tablespoons honey.
2 cups apple cider or apple juice, 2 cups brown sugar, ¼ cup coarse ground mustard, ¼ cup honey
Place the ham in a rimmed dish and pour the apple juice mixture over the entire ham. Rub it in and around the ham – being sure to get in between the slices of ham (as much as possible).
6-7 lb. spiral ham
Spray the pan insert with cooking spray and pour 1 cup apple juice in the bottom. Place the ham in the Instant Pot and pour any leftover juices that had drained off the ham back over the ham. Cover and lock the lid in place with the vent closed. Set the Instant Pot on manual and on high pressure for 15 minutes. Allow the steam to release naturally (unless you are in a hurry, then do a quick release of the steam).
While the ham is cooking, cover a rimmed baking sheet with foil, and spray the foil with nonstick spray.
Set the oven to broil.
Remove the ham from the pressure cooker and place it on the prepared baking sheet.
Combine ½ cup apple juice, 2 tablespoons coarse mustard and 2 tablespoons honey in a small bowl. Brush the apple juice mixture over the cooked ham. Rub (and press) 1-cup brown sugar into the top surfaces of the ham, and place the ham under the broiler 5-10 minutes or until the glaze is bubbly and caramelized.
2 cups apple cider or apple juice, 2 cups brown sugar, ¼ cup coarse ground mustard
Transfer the ham to a cooling rack and cool for a few minutes. Serve warm or cold.