Jelly Roll

Ingredients

 * 9 eggs, separated
 * 3/4 cup sugar
 * 1/2 cake meal
 * 1/4 cup potato starch
 * Lemon juice
 * Jam / filling

Steps
Beat egg whites until stiff. Add sugar and beat until combined. Beat egg yolks with lemon juice and fold into egg white mixture. Put parchment paper into bottom of jelly roll pan (or rimmed cookie sheet) and smoothe in the batter. Bake at 350° until light golden brown. When done, put the pan face down on a clean smooth towel. Peel off the parchment paper and let cool. Cover the entire top surface with jam / filling. Using the towel to begin, roll up snugly from the narrow side.