How to make
Sift the flour with the baking powder into a bowl. Add to it the egg whites slightly beaten with sugar (a foamy mixture should not be obtained). Add the butter, vanilla sugar and lemon peel and mix with a wooden spoon.
Transfer the dough onto a floured surface and sprinkle a little more flour if it's too soft, but just enough to keep it from sticking to your fingers and the surface. Shape the dough into a ball and refrigerate it for 1 hour to set.
Tear off pieces the size of a walnut from the hardened dough. Roll them into a ball and flatten them into a thin biscuit (it will rise later). You can press the top with a fork for a more interesting look.
Arrange the sweets on a tray lined with baking paper, spaced apart. You will get 3 trays from the standard ones in each oven. Bake each portion for 10-12 minutes, or until they aquire a light golden brown color.
Allow the sweets to cool and when they do, melt the chocolate with the butter and some of the cream over a water bath or very low heat in a thick-bottomed metal pot. Add enough milk to get a thick and sticky consistency.
Place a spoonful of chocolate on bottom of one sweet and stick it together with another one. Arrange them onto kitchen paper or aluminum foil.
Dilute the remaining chocolate with more cream to make it more liquid, if necessary add more than the specified amount. Sprinkle the stuck together sweets with it and leave them like this for 1-2 hours, so that it hardens well.
Instead of chocolate, you can use jam of your choice to stick them together, but the only condition is that it is thick and sticky. Another very good option is to stick the sweets together with dulce de leche - it turns out great!
* If the sweets are not consumed the same day, it is good to store them in a closed container, so that they do not harden too much. In the summer, when it's very warm, refrigerate them in a well-sealed container, because of the chocolate, so it doesn't soften. It's a good idea not to stack them on top of each other if the chocolate on top hasn't hardened well enough.
