Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Line a baking tray with baking paper. Wash gooseberries, dab dry and clean. Mix with maple syrup and spread on the tray.
Sprinkle with 2 tablespoons of sugar. Roast in a hot oven for 20-25 minutes. Remove the gooseberries, let them cool down briefly and reduce the oven temperature (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer).
Grease a springform pan (26 cm Ø) and dust with flour. Cream 175 g butter, 175 g sugar and vanilla sugar with the whisks of the mixer. Stir in the eggs one by one. Mix 275 g flour and baking powder and stir in alternately with the buttermilk.
Smooth the dough into the mould.
Pour the syrup, which is the result of roasting the gooseberries, into a small pot. Spread a good half of the gooseberries on the dough. (Caution: they are very soft!) Bake in a hot oven for 45-50 minutes.
In the meantime reduce the syrup to about half its original volume.
Take out the cake. Spread the rest of the gooseberries on top and sprinkle with the syrup. Let the cake cool down, then remove from the mould. Cream double tastes good with it.