Wash the potatoes thoroughly and cut into slices. Heat the oil in a large pan and fry the potatoes for about 20 minutes while turning them regularly until crispy. Season with salt and pepper.
In the meantime, wash and clean the zucchini, cut in half lengthwise and slice. Clean, wash and cut the peppers into strips. Leek onions clean, wash and cut into rings. For the Schmanddip, wash basil, shake dry, pluck leaves from stems and cut into strips.
Season sour cream with salt, pepper, sugar and basil, except for a little to garnish. Remove potatoes from the pan and keep warm. Fry the prepared vegetables in the frying fat for about 10 minutes, turning.
After 5 minutes pour on the stock and bring to the boil. Put the potatoes back into the pan and fold in. Serve with sour cream and sprinkle with remaining basil.