Easy Backed Beans

1 (14oz) can black beans 1
1 (14oz) can kidney beans
1 (14oz) can great Northern white bean
1 (14oz) can small red bean
1/3-1/2 cup ketchup
2-3 Tbl spicy mustard
2-3 tsp liquid smoke
1/3 cup brown sugar

Drain all the beans and combine in a large soup pot. Add all ingredients and simmer to warm through. Taste and adjust seasonings. Serves 6.