1. Mix roughly with your fingers the brown sugar, butter, hazelnut powder, and flour to get a crumbly dough.2. Place this dough on a pastry sheet and bake for 15 minutes at 200°C.3. Let the dough cool before breaking it into small irregular pieces.4. Wash the strawberries, cut them in half, and place them in a bowl with sugar, lemon juice, and grated zest.5. Mix and distribute into small hollow plates.6. When serving, heat the oven grill, sprinkle the strawberries with the crumble dough pieces. Pass the plates under the grill for 1 minute. Serve warm with vanilla yogurt or ice cream.