Divide the egg yolks from the whites. Whisk the whites until it forms peaks.
Take the zest and the juice from the lemon.
Whisk the yolks with the sugar until it gets creamy. Add the lemon juice and zest, then the flour and the baking powder, and finally the melted butter.
Add the egg whites, taking care to incorporate them gently, without crushing them.
Bake 20 minutes at 360°F (180°C)
There you are !
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