Four-Bean Baked Beans recipe

1 (1 pound) can pork and beans
1 (1 pound) can kidney beans
1 (1 pound) can butter beans, drained
1 (1 pound) can French-style green beans, drained
1/2 to 1 pound bacon, cut into cubes
1 tablespoon prepared mustard
2 onions, chopped (about 1 cup)
1/2 cup catsup
1/2 cup brown sugar, firmly packed
1/4 cup molasses
2 tablespoons vinegar
Dash of Worcestershire sauce
1/2 teaspoon salt
1 (18 ounce) can crushed pineapple, drained well (optional)

Heat oven to 350 degrees F. Brown bacon and drain off fat. Mix all ingredients well. Bake for 1 hour, until hot and bubbly, or longer, if desired.