Mix flour, eggs, milk and 1 pinch of salt until smooth. Let the dough swell for about 20 minutes
Clean or peel, wash and slice the leek and carrots. Sauté both in 1 tbsp. hot oil. Season with salt and pepper. Deglaze with approx. 1/2 l water, bring to the boil and dissolve the stock. Simmer vegetables for about 10 minutes. Thicken sauce and refine with crème fraîche. Season to taste with salt and pepper
Peel and finely chop the onion. Fry the minced onion in 1 tbsp. hot oil until crumbly. Add onion and fry. Sweat tomato paste briefly. Season with salt, pepper and herbs. Stir in 2-3 tbsp. water if necessary.
Heat the fat in portions in a coated pan. Bake 2-3 pancakes from the dough one after the other. Spread the minced meat on them, roll them up and cut them into diagonal pieces. Place the crespelle in a large greased baking dish and spread the vegetable sauce around it. Cut olives from the stone. Sprinkle with the cheese. Bake in a preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 20-30 minutes