3 egg whites
1/2 teaspoon lemon zest
1/2 teaspoon vanilla extract
1/2 cup finely chopped almonds
Line baking sheets with parchment paper, spraying with non-stick spray on top of paper. Preheat oven to 350 degrees F (175 degrees C). Grease cookie sheets.
Beat egg whites, lemon zest and vanilla extract into lemon-lime chocolate, stirring constantly. Beat hard with electric mixer bowl until ingredients are well blended. Gradually beat in chopped almonds. Spread cookies into 8-inch pans.
Bake at 350 degrees F (175 degrees C) for 8 hours, or until edges are slightly blackened. Cool on baking sheets completely before removing from pan.