Spread the hazelnuts on a baking sheet and roast for 10 to 15 minutes, until lightly golden and fragrant. Be careful not to let them brown too much.
350 g hazelnuts
Let the hazelnuts cool for a few minutes, then rub them in a clean kitchen towel to remove the skins.
Place the hazelnuts and ground tonka bean in a food processor and blend until smooth and fluid. Add a spoonful of oil, if needed, to adjust the consistency.