In a large roasting pan (big enough so the ham doesnt touch the sides). Place the ham in the bottom. Score the top making cut 1/8" deep in a diagonal pattern with cuts approximately 1" apartbsp. Pour pineapple juice in bottom of roasting pan. Spread the brown sugar evenly over top of the ham. Pour crushed pineapple over brown sugar. Cover the pan with a lid or tent with foil. Bake in a preheated 325 degree oven for 3 - 5 hours, until the internal temperature reaches 160 degrees. Basting with pineapple juice every 45 - 60 minutes