Prepare all ingredients:
Warm the butter in a saucepan.
the whole eggs with sugar and salt in .
Little by little, add the flour, melted butter, lemon zests...
...until you acheive a smooth batter.
Fill each silicone mold halfway.
Bake in warm oven for 5 to 8 minutes,...
... then in hotter oven for about another 10 minutes.
When finished, leave to cool...
...and unmold onto a cooling rack.