Gluten-free Potato Starch Muffins

Description
Recipe makes 12 muffins.

Ingredients

 * 4 eggs, separated
 * 1 tablespoon sugar
 * 2 tablespoons cold water
 * ¾ cup potato starch
 * ½ teaspoon salt
 * grated rind of ½ lemon

Directions

 * 1) Beat the yolks until light.
 * 2) Gradually add the sugar.
 * 3) Beat until light and creamy.
 * 4) Add the water and grated rind.
 * 5) Slowly sift in the potato starch.
 * 6) Blend well.
 * 7) In another bowl, beat the egg whites with the salt at low speed until frothy; increase the speed to high and beat until peaks form.
 * 8) Carefully fold the stiffly beaten egg whites into the yolk batter.
 * 9) Fill greased muffin cups half full.
 * 10) Preheat oven to 350 °F.
 * 11) Bake for 12 to 15 minutes.