Homemade Steak Sauce
["6 Tbsp. butter", "3 Tbsp. Worcestershire sauce", "1 1/2 Tbsp. spicy brown mustard", "1 tsp. tomato paste or catsup"]
["Melt butter in small pan over low heat.", "Whisk Worcestershire sauce, mustard and tomato paste or catsup until well blended and smooth, about 1 minute.", "Serve sauce over steaks immediately."]
["butter", "Worcestershire sauce", "brown mustard", "tomato paste"]