Ferrero rocher cakes

Ingredients

• 3 eggs
• 135 grams (4.76 ounces) sugar
• 5 grams (0.18 ounces) vanilla sugar
• 140 grams (4.94 ounces) flour
• 6 grams (0.21 ounces) baking powder
• 30 grams (1.06 ounces) alkalized cocoa
• 1 gram (0.04 ounces) salt
• 120 milliliters (0.5 cup) milk
• 60 grams (2.12 ounces) butter
• 100 milliliters (0.42 cup) freshly brewed strong coffee
• 10 grams (0.35 ounces) sugar
• 150 grams (5.29 ounces) white chocolate
• 50 grams (0.21 cup) cream 35%
• 100 grams (3.53 ounces) hazelnuts
• 80 grams (2.82 ounces) wafer crumbs
• 35 grams (1.23 ounces) butter
• 35 grams (1.23 ounces) powdered sugar
• 35 grams (1.23 ounces) egg whites
• 35 grams (1.23 ounces) flour
• 170 grams (6 ounces) bitter chocolate
• 270 grams (1.14 cups) cream 35%
• 140 milliliters (0.59 cup) milk
• 6 grams (0.21 ounces) gelatin (Dr. Oetker)
• 36 milliliters (2.43 tablespoons) cold water
• 350 grams (12.35 ounces) bitter chocolate
• 70 grams (3.76 tablespoons) vegetable oil
• 30 grams (1.06 ounces) cocoa butter
• 70 grams (2.47 ounces) chopped hazelnuts