Lemon Swirl Biscuit

Lemon Swirl Biscuit
 Ingredients for 4 people.
Biscuit :
3 eggs
150 g of sugar
30 g of flour
50 g of potato starch
sel
Lemon cream:
2 lemons
2 eggs
125 g of sugar
50 g Butter
15 cl liquid cream
80 g of dark chocolate