When pattie is just starting to turn brown flip and brown other side. In another bowl with an electric mixer beat egg whites until they just hold stiff peaks and gently fold into batter. Heat a non-stick skillet over moderate heat and brush with some melted butter. Cook pancakes until bubbles appear on surface and undersides are golden, about 1 minute. Turn pancakes and cook until undersides are golden.
Transfer pancakes to a rack and cool.
Makes about 46 appetizers. Mix thoroughly so potatoes are coated with olive oil. Put potatoes aside to cool. Mix salmon, sour cream, horseradish, capers, onions into a bowl. Break up potatoes to smaller pieces, add smoked salmon mix, add salt and pepper to taste, and mix well.