Place the sugar, almond powder and flour in a bowl. Mix well. Add egg and melted butter. Beat the egg whites with an electric mixer. Incorporate ⅓ of the whites into the batter and mix to soften. Add the rest and mix gently. Pour onto a baking sheet, smoothing the surface. Bake at 180°C for 10 to 12 minutes. Leave to cool, then cut out a 20×11 cm rectangle to fit your pastry frame.
The rest of the recipe is available in the recipe card on sale in my store. You can also find this recipe in my latest Ebook – Gâteaux saveurs estivales 2024.