Tabasco Barbecue Sauce

Use this for all meats, chicken and turkey parts.

2 tablespoons butter or margarine
1 medium onion, chopped
1 clove garlic, chopped
1/2 cup chopped celery with leaves
1/4 cup chopped green bell pepper
1 (1 pound 4 ounce) can tomatoes
1 (6 ounce) can tomato paste
1 bay leaf
2 teaspoons Tabasco