1. Preheat the oven th . 6 (180°C).
2. Turn the butter into mousse. Separate the egg whites from the egg yolks.
3. Add the egg yolks and sugar and beat until the mixture is smooth.
4. Pour the milk and gradually incorporate the sifted flour with added yeast, lemon juice and a little grated zest.
5. Finally, introduce the egg whites in heavy snow.
6. Pour in buttered mold and bake for about 1 hour.
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