Wash and peel the potatoes and cut them into thin slices. Cover with cold water. Apple wash, quarter, core and cut into thin slices. Drizzle apple slices with lemon juice. Peel and finely chop the onion. Wash the thyme, dab dry and pluck off the leaves, except for something to garnish.
Mix milk, egg, thyme and half the onion. Season well with salt, pepper and nutmeg. Drain the potatoes and layer them together with the apple wedges in a small, greased gratin dish (18-20 cm Ø). Pour egg milk over it and bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 35-40 minutes. In the meantime, wash and drain the tomatoes and cut them in half. Clean the lamb's lettuce, wash thoroughly several times and also drain. Mix vinegar, some salt, pepper and the remaining onions and finally add 1 tablespoon of oil. Coarsely crush colored pepper and turn the steaks in it. Heat 1-2 tablespoons of oil in a coated pan and fry the steaks for 3-4 minutes while turning. Salt the steaks, wrap them in aluminium foil and let them rest for 2-3 minutes. In the meantime mix tomatoes, lamb's lettuce and vinaigrette.
Clean the lamb's lettuce, wash thoroughly several times and also drain. Mix vinegar, some salt, pepper and the remaining onions and finally add 1 tablespoon of oil. Coarsely crush colored pepper and turn the steaks in it. Heat 1-2 tablespoons of oil in a coated pan and fry the steaks for 3-4 minutes while turning. Salt the steaks, wrap them in aluminium foil and let them rest for 2-3 minutes. In the meantime mix tomatoes, lamb's lettuce and vinaigrette. Arrange fillet steaks and gratin on plates and sprinkle with remaining thyme. Add salad
Waiting time approx. 10 minutes