Preheat oven to 325 degrees F.
Place the ham in a roasting pan, or place a cooling rack on top of a baking sheet like I did, and bake for 1 - 2 hours, or until the center of the ham has reached 140 degrees.
While the ham is cooking, make the sauce.
Start by combining 1/4 cup of water, brown sugar, soy sauce, ketchup, mustard, and canned crushed pineapple together in a saucepan.
Bring it to a boil over high heat, stirring occasionally.
Once it's boiling, reduce the heat to low. Cover the saucepan and let simmer for 10 minutes.
While the mixture is simmering, separately combine cornstarch and water and stir until there are no chunks remaining.
After the 10 minutes is up, stir in the cornstarch and water mixture and bring it to a boil.
Let the mixture boil for 2 minutes, stirring constantly, so it can thicken.
Serve with the ham!
Take 5 seconds to . We greatly appreciate it!