Mix the egg with the sugar, the salt, the zest from the lemon and the grated long pepper.
Mix it well and then while beating it with a whisk heat it up till the temperature is 37 °C. Do this over a double boiler.
Once it has the right temperature take it off the heat and start beating it with a stand mixer. You want nice thick fluffy peaks.
Then transfer the flour on a sieve and tap the side of the sieve. Fold it in till all the flour is incorporated and you have a fluffy even batter.
Now divide the batter on two silicon sheets and level it with a pallet knife.
Bake them at 220 °C for 5 to 6 minutes. Then let them cool down before it's ready to be used
