For the dough, crumble yeast in 1⁄8 l lukewarm water. 1⁄2 Add TL sugar and stir until the yeast has dissolved. Let stand for about 5 minutes.
Mix 300 g flour and 1⁄4 TL salt in a bowl. Add yeast water. Knead into an elastic dough with the dough hooks of the mixer. Cover and leave to rise in a warm place for about 1 hour until the dough volume has doubled.
For the cream mix sour cream and mustard. Season to taste with salt. Wash and clean the gooseberries.
Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer). Line two baking trays with baking paper. Knead the yeast dough again slightly and divide into 8 portions. Roll out dough portions one after the other on a floured work surface to form long strips.
Spread out on the sheets. Spread a thin layer of mustard cream and cover with gooseberries. Bake in a hot oven for about 10 minutes.
Meanwhile, sort out the rocket, wash, shake dry and spread on the finished strips.