This Thermomix recipe for hazelnut and lemon cake is a bright and flavorful dessert that is perfect for spring. The cake is made with ground hazelnuts and almond flour, and is flavored with fresh lemon zest and juice. The result is a moist and fragrant cake that is both sweet and tart. Serve it with a dusting of powdered sugar and a slice of fresh lemon for a beautiful and delicious dessert.