Pre-boil the lasagne plates in boiling salted water for 4-5 minutes, drain. Wash, clean and dice the zucchini. Peel onion and garlic, dice finely. Add some rosemary to the S
Fry the onion and garlic in hot oil. Add zucchini and herbs and steam briefly. Add the strained tomatoes and let it boil down a bit. Cut olives into slices. Dice artichoke hearts.
Add both to the sauce. Season to taste with salt and pepper. Put some filling in the middle of the lasagne plates, place a short end on top and roll up. Heat the fat in a saucepan and sauté the flour in it.
Add milk and stock while stirring and boil thoroughly. Season to taste with salt and pepper. Place the lasagne rolls, remaining vegetable sauce and béchamel sauce in a greased casserole dish. Sprinkle with cheese and bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 35 minutes.
Garnish with set aside rosemary.