Mussels In White Wine Sauce
["2 lb. mussels, washed and debearded", "1 small onion, diced", "1 small tomato, peeled, seeded and diced", "1 Tbsp. fresh chopped parsley", "1 clove garlic, chopped", "1/4 c. white wine (dry)", "3 to 4 oz. cold butter, cubed", "salt and pepper"]
["Melt 1 tablespoon of the butter in large pot (big enough to hold mussels).", "Add onion and parsley.", "Cook over medium heat until fragrant.", "Add garlic and wine.", "Cook about 1 minute.", "Add mussels and tomatoes.", "Cover and cook until mussels have opened (3 to 5 minutes)."]
["mussels", "onion", "tomato", "parsley", "clove garlic", "white wine", "cold butter", "salt"]