Peel the onions and cut them into halves or quarters, depending on their size. Remove the garlic cloves from the bulb. Wash, clean and halve the pumpkin and remove the seeds. Cut the flesh into slices, possibly halve the slices. Wash, clean and halve the tomatoes. Peel and wash potatoes and cut them into thirds lengthwise. Wash thyme, shake dry. Put 3-4 stems aside, pluck the leaves from the remaining stems
Put onions, garlic, pumpkin, tomatoes and potatoes in a large bowl. Add thyme, 1 tablespoon sea salt and olive oil, mix well. Place on the fat pan of the oven and bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 40-50 minutes
In the meantime, cut the fat side of the meat with a sharp knife. Heat the oil in a pan and fry the meat for 3-5 minutes on each side, depending on its thickness. Season with salt and pepper and remove. Wrap in foil and let it rest for about 10 minutes
Arrange the vegetables on a plate, sprinkle with 1/2 tablespoon sea salt and garnish with the remaining thyme. Add meat, sprinkled with ground pepper. Herb butter tastes good with it