Heat oil in heavy large saucepan over medium heat. Add onion and cook until soft, about 8 minutes. Add chili powder and mustard and stir 1 minute. Add water, beans, tomatoes with their juices and molasses. Simmer soup 15 minutes, stirring occasionally and breaking up large chunks of tomatoes with back of spoon. Season with salt and pepper. Makes 2 generous servings; can be doubled If you prefer a thicker soup, remove one cup of the beans, mash them to a paste, then stir them back into the soup. Coleslaw and corn bread squares round out the menu; a simple baked apple could be the perfect finale. Recipe from Bon Appetit, March, 1993 inch30-Minute Main Courses"