Separate eggs. Beat the egg whites and mineral water with the whisks of the hand mixer until stiff. Let sugar trickle in. Stir in egg yolk. Sift flour and starch on top and fold in carefully. Spread on 2 baking trays lined with baking paper.
Bake the trays one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 10-12 minutes. Remove and turn out on a damp tea towel. Let them cool down. Cut out 32 crowns (7.5 cm). Heat up the raspberry jam. Spread 24 crowns with raspberry jam. Put 3 crowns on top of each other. Finish with the remaining (uncoated) crowns and press them down a little. Place all stacks of crowns on a tray and cover with foil. Weigh down with a marble slab or books and leave to stand for about 2 hours. Roughly chop the chocolate coating.
Spread 24 crowns with raspberry jam. Put 3 crowns on top of each other. Finish with the remaining (uncoated) crowns and press them down a little. Place all stacks of crowns on a tray and cover with foil. Weigh down with a marble slab or books and leave to stand for about 2 hours. Roughly chop the chocolate coating. Melt the couverture and coconut oil in a warm water bath. Cover the crown with couverture and decorate with sugar pearls