Mix the flour, sugar, vanillina, a bit of lemon peel and powder. Make a hall in the middle and add 1 egg,1 yolk egg, 1 teaspoon of almond juice and the melted butter. Knead with the fingers of your hands but not too much. The segret is to knead for just few minutes. Put the dough to rest in the fridge.
After 30 minutes you can star to do biscuits. Stretch the dough using rolling pin till you get a stip of 3-5 millimetres. Use the shape-cutter and get 30 pieces. In 15 of them do a hole in the centre with your favorite shape and use them to cover the cookies. Put on 15 discs just a little of jam and then cover them with the others pieces with the hole.
Bake them for 10 minutes at 150°
Leave them get cold and cover them with dust sugar