Wash the meat and dab dry. Season with salt and pepper and place bacon on top of the meat. Place on the greased fat pan of the oven. Roast in the preheated oven (electric cooker: 150 °C/ gas: level 1/ convection oven: not suitable) for approx. 1 hour. In the meantime peel onions and cut them into slices.
Clean and wash the leek and cut into diagonal rings. Clean the mushrooms. Wash the tomatoes. After 1 hour cooking time put vegetables on the fat pan. Continue cooking for 30 minutes, turning occasionally. Season with salt and pepper. Increase oven temperature (electric cooker: 200 °C/ gas: level 3/ convection oven: not suitable) and continue cooking for 20 minutes. Peel and wash the potatoes. Cook in boiling salted water for about 25 minutes, drain. Let roast rest in the switched off oven for about 15 minutes and cut into slices.
Season with salt and pepper. Increase oven temperature (electric cooker: 200 °C/ gas: level 3/ convection oven: not suitable) and continue cooking for 20 minutes. Peel and wash the potatoes. Cook in boiling salted water for about 25 minutes, drain. Let roast rest in the switched off oven for about 15 minutes and cut into slices. Arrange roast and vegetables with stock on a plate and serve with potatoes. Garnish with thyme as desired