Defrost the dough. Peel and chop the garlic. Clean and wash the vegetables. Cut zucchini into slices and spring onions into rings. Dice peppers, halve tomatoes
Briefly fry the vegetables and garlic in hot oil. Season and cool. Whisk whole egg and sour cream
Roll out the dough into 6 rectangles (approx. 12 x 24 cm). Cut in half crosswise. Put some breadcrumbs in the middle, spread sour cream and vegetables on top. Fold the corners inwards and press on. Place 6 patties on a baking tray lined with baking paper. Bake in a hot oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for about 20 minutes
Whisk the egg yolk and cream. After about 15 minutes, spread on the edges. Sprinkle the seeds over them and bake until done. Bake the rest of the patties in the same way