Easy Black Bean Soup
["2 Tbsp. butter or margarine", "1/4 c. minced onion", "1 (11 oz.) can condensed black bean soup", "1 1/2 c. water", "1 Tbsp. lime juice", "3 frankfurters"]
["Melt butter in saucepan; add onion and cook until tender, but not brown.", "Add soup and water; bring to boiling point.", "Add lime juice.", "Slice frankfurters into 1/4-inch rounds; add to soup and heat thoroughly.", "Makes 4 generous servings."]
["butter", "onion", "condensed black bean soup", "water", "lime juice", "frankfurters"]