INGREDIENTS
1/2 cup
Chocolate hazelnut spread such as nutella
1/2 cup
All-purpose flour
3 1/2 oz
Bittersweet chocolate, fine quality
4 tbsp
Cocoa powder, unsweetened Dutch-process
1/8 tsp
Salt
6 tbsp
Sugar
2 tbsp
Hazelnuts
1/2 stick
Butter, unsalted
1 13/16 cups
Heavy cream
1/2 cup
Mascarpone
1 tsp
Gelatin, unflavored
3 tbsp
Water
1
Parchment paper
an 8-inch (20-cm) springform pan; parchment paper