Baked Beans

1 c. sliced onions
2 Tbsp. fat
1 (3 oz.) size deviled ham
1 Tbsp. prepared mustard
2 Tbsp. molasses
1/4 tsp. salt
2 (#2) size cans pork and beans
2 tomatoes or 1 canned tomatoes, drained cook onions in hot fat until brown. Combine remaining ingredients except tomatoes. Alternate layers of bean mixture and onion and tomato slices in a 1 1/2 quart casserole. Bake at 350 for 30 minutes.