Potato Pancakes
["2 Tbsp. butter", "4 medium potatoes (raw), grated", "2 egg yolks, well beaten", "1 c. grated onion", "1 tsp. salt", "2 egg whites, beaten stiff"]
["Mix all ingredients together except butter and egg whites. Just before cooking, fold in beaten egg whites.", "Melt butter in skillet over medium heat.", "Form the mixture into patties.", "Fry 4 or 5 at a time in melted butter until golden brown.", "Turn once."]
["butter", "potatoes", "egg yolks", "onion", "salt", "egg whites"]