Wash and clean the gooseberries and drain well. Chop the hazelnuts coarsely.
For the crumbles, mix flour, 180 g butter in pieces, sugar, 1 pinch of salt and cinnamon in a large mixing bowl first with the dough hooks of the mixer, then quickly work into crumbles with your hands.
Add gooseberries and hazelnuts to the crumble. Spread everything in a greased springform pan (26 cm Ø). Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer) for about 40 minutes. Take out and let it cool down. Whipped cream tastes good with it.