Preheat oven 325 degrees.

Place ham in a baking pan. Ensure the pan is deep enough to contain liquid. Pour 1/2 of the pineapple juice from can all over the ham.

Brush generously the entire outside of the ham with mustard. You may need more/less than 2 Tbl of mustard depending on the size of the ham.

Once the ham is covered with mustard, coat it with brown sugar. Again, you may need more/less depending on size.

Secure the pineapple rings on the ham using toothpicks. I like to break the toothpicks in half for each ring.

Cover the ham lightly with aluminum foil and bake according to weight. Typically it's 15-20 min per 1 lb of ham. For a 10 lb ham, it'll take 2.5-3 hours.

Once finished cooking, remove the toothpicks and pineapples before cutting.

I like to pour the juice in the pan on top of the sliced ham. I also serve it with the cooked pineapples on the side.