This hazelnut and lemon cake is a refreshing dessert that is perfect for spring or summer. The nutty taste of hazelnuts is complemented by the tangy flavor of lemon, making this cake a delicious and unique treat. To make this cake, you will need hazelnut flour, eggs, sugar, butter, lemon zest, lemon juice, and baking powder. Mix all the ingredients together, pour the batter into a cake pan, and bake for 30-35 minutes. Once the cake is cooled, you can top it with a lemon glaze or whipped cream for an extra burst of flavor.