For the dough mix flour, 1/8 litre water, milk and eggs and let it swell for about 30 minutes. Peel and wash the celery and cut it into cubes of about 1 cm. Clean the leek, cut it in half lengthwise, wash it and cut it into 1 cm wide half rings.
Peel the carrots, cut them in half lengthwise and cut them diagonally into thin slices. Roast sunflower seeds in a pan without fat until golden brown. Fry 8 pancakes (approx. 20 cm Ø) one after the other in a little oil.
Keep pancakes warm in the preheated oven (electric cooker: 100°C/ gas: level 1). Sauté vegetables in fat. Fill up with broth and steam covered for about 5 minutes. Wash parsley and dab dry.
Chop parsley leaves, except for some for garnishing. Stir the sour cream into the vegetables. Season with salt and pepper. Fold in parsley. Fill pancakes with vegetables and arrange on a plate.
Sprinkle with sunflower seeds. Garnish with the remaining parsley.