Pre heat oven to 350 degrees F
2. Whip the egg yolks till they are creamy, add the sugar
3. Fold the mixture into the egg whites.
4. Add the sifted flour and lemon peel by sprinkling in small batches and gently folding in. Be careful to not over mix.
5. Place into a 9 or 10 inch Spring form pan that has been buttered and floured.
6. Bake on the middle shelf for 15 to 20 minutes or till a toothpick comes out clean.
Remove from the oven and let cool for 10 minutes before unmolding.