Easy Baked Beans

2 - (1 pound) cans pork and beans in tomato sauce (about 4 cups)
3/4 cup brown sugar
1 tsp dry mustard
6 slices bacon, chopped, raw
1/2 cup ketchup

Combine all ingredients in 2 quart casserole. Mix well. Bake uncovered, in slow over 325F for 2 1/2 hours. Serves 6-8.