Cut the pumpkin into quarters. Scrape out seeds and fibers with a tablespoon. Cut the pumpkin into slices, peel and cut into pieces. Preheat oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2).
Peel, wash and slice the parsnips. Wash thyme, dab dry, chop coarsely.
Line a fat pan (deep baking tray) with baking paper. Spread pumpkin and parsnips on it. Sprinkle with thyme, up to 1 tsp., 1 1/2 tbsp. sugar and approx. 1 tsp. salt and pepper each. Sprinkle with 2 tablespoons of oil.
Bake in a hot oven for about 45 minutes.
Meanwhile peel onions and garlic, dice finely. Heat 1 tablespoon of oil in a large pot. Roast the pumpkin seeds in it while turning and take them out. Heat 1 tablespoon of oil in the pot. Press sausage meat in small portions directly from the skin into the hot oil, fry all around for 2-3 minutes.
Take it out. Sauté onions and garlic in frying fat. Take the vegetables out of the oven and add them, except for some vegetable pieces. Add 1 1/2 l water and broth and bring to the boil.
Puree everything with a hand blender. Add the vegetable pieces and meatballs to the soup and leave to stand for about 5 minutes. Season to taste with salt and pepper. Sprinkle with rest of thyme and possibly pumpkin seeds.