1 Tablespoon flour
1 (20 oz.) can crushed pineapple, drained
1 Tablespoon cornstarch
Big oven cooking bag
12 to 16 lb. fully-cooked ham
1/2 cup apple jelly
2 Tablespoons lemon juice
1/8 teaspoon ground cinnamon
Shake flour in cooking bag. Place in large roasting pan at least 2 inches deep.
Lightly score surface of ham. Place ham in bag.
Combine pineapple, jelly, lemon juice, cornstarch and ground cinnamon in saucepan; stir and cook until cornstarch dissolves.
Bring to a boil. Simmer 1 minute. Pour sauce over ham in bag.
Bake 2-1/2 to 3-1/4 hours.