Over medium heat, heat up the refried beans and water, stirring frequently. Remove from heat. Spread on slices of bread and add the minced onion, tomatoes slices and lettuce for an open-face or traditional sandwich.
Variartions: Add radish slices, cucumbers, whole lettuce leaves, thinly sliced onions instead of minced.
Per serving - 0 calories, 0 g fat (0% calories from fat), 0 g protein, 0 g carbohydrate, 0 g fiber, 0 mg cholesterol, 0 mg sodium