Ingredients
Method
Make the Chocolate Sponge
- Mix the oil and milk, then add flour, cocoa, and salt.
- Incorporate egg yolks and mix thoroughly.
- Whip egg whites with vinegar, gradually adding sugar until stiff peaks form.
- Gently fold the egg whites into the batter followed by hazelnut powder.
- Spread the batter on a baking sheet lined with parchment paper and bake for 20 minutes at 170°C.
- Let cool slightly, roll in parchment and a towel, and set aside.
Prepare Hazelnut Praline
- Toast hazelnuts until uniformly colored.
- Make a syrup with water and sugar, then add hazelnuts to caramelize.
- Spread on a non-stick surface, let cool, crush, and blend until smooth, adding fleur de sel.
Prepare Hazelnut Whipped Ganache
- Soak gelatin in cold water.
- Melt chocolate and mix with hot cream.
- Add cold cream and hazelnut praline, blend, and let rest overnight in the refrigerator.
- Whip to firm consistency the next day.
Make Rocher Glaze
- Melt both chocolates together.
- Add grape seed oil and crushed hazelnuts, then let cool slightly.
Assembly
- Spread salted butter caramel over the cooled chocolate biscuit.
- Add hazelnut whipped ganache, followed by layers of hazelnut praline and more caramel.
- Gently roll the log and freeze for 30 minutes.
- Trim the ends, cover with rocher glaze, and decorate with hazelnuts and chocolate pearls.
Notes
Room temperature ingredients make batter and ganache smoother. Fold egg whites gently to preserve airiness. Chill the ganache mixture overnight for best texture. Use a warm knife for clean slices.
