in a mixer with a paddle attachment , combie the hazelnut flour . 225 g of sugar and the eggs . Once combined . add the melted butter . Whip the egg whites with 56 g of sugar to medium peaks . Combine the two mixtures , and bake at 180℃ for 20 minutes in a full sheet pan lined with a silicone mat . Allow to cool and cut into four 16 cm round circles . Reserve in the fridge