Dedicating yolks from egg whites, using only 3 yolks. In bowl whisk the egg whites to snow and add to the salt and 1 tsp sugar. In another bowl whisk the egg yolks with the remaining sugar, lemon rind, juice, flour and milk. Finally, egg whites are placed in the egg yolks and mix very carefully from the top down with no stirring. When the mixture is ready to pour into shapes and bake in a water bath until golden brown catch. Finished soufflés are sprinkled with powdered sugar.