Print Recipe Beef Stroganoff Course Main Dish, Pasta Cuisine American Servings Ingredients 1/4 cup butter2 medium onions diced1 Tbs dry mustard1 tsp sugar1/4 tsp sea salt1/4 tsp black pepper2 4 ounce jars sliced mushrooms drained2 pounds sirloin steak cut in 1-inch cubes1 pint sour cream …