Combine first seven ingredients and stir until smooth: Beat 4 to 5 egg whites until very stiff. Fold them into the yolk mixture. Melt 2 Tbsp of butter in a heavy 10-inch Skillet. When the skillet is hot, pour in the pancake batter. Cook  over a medium heat, partly covered with a lid, for about 5 Minutes. Or the batter may be cooked until it begins to set and then be placed briefly in a preheated 400 degree oven until it is puffed and firm. Cooking time in all is about 7 minutes. It should puff up well, but it may fall, so serve it at once with: Confectioner's sugar and cinnamon or lemon juice; covered with jam or jelly and rolled; or with wine, fruit, or rum sauce.