For the nut-foam slices, knead a shortcrust pastry from the given ingredients. Line a baking tray with baking paper, roll out the dough to a thickness of approx. 4 mm, place on the baking paper and bake at 200 °C until semi-finished.
Brush the hot dough with jam. Beat egg whites with granulated sugar until stiff, fold in hazelnuts.
Spread the mousse on the jam and bake until done. Divide into slices.