Buy croissants from the bakery from the day before (cheaper!) And leave them for a few days until they are hard. Then grate finely (like breadcrumbs) with a common household grater. Dissolve staghorn salt in the water. Put all ingredients in a large bowl and mix with the staghorn salt water.
Spread approx. 40 g of the gingerbread mixture on each wafer (diameter 7 cm). Slightly moisten your fingers if necessary. Bake in the preheated oven top / bottom heat 200 ° C // hot air 170 ° C for approx. 15 minutes.
Allow to cool on a wire rack and cover with a mixture of couverture and cake icing. First heat the cake icing and then dissolve the couverture. Decorate as you wish.
Note: It can also be tasted without lemon peel and orange peel.