Wash the pumpkin, quarter it and remove the seeds. Cut quarters into thin slices. Mix pumpkin with oil, salt and pepper. Put them on a baking tray. In a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see
manufacturer) cook for about 20 minutes. Sprinkle with pumpkin seeds about 5 minutes before the end of the cooking time.
Clean, wash, shake dry and pluck the salad. Halve the avocado and remove the seeds. Remove the flesh from the skin and dice. Sprinkle the flesh with lemon juice. Wash chives and thyme and shake dry.
Cut the chives into fine rolls. Pluck the thyme leaves from the stalks and chop finely.
Mix quark, vinegar, mustard, chives, except for a little bit for sprinkling, and thyme. Season to taste with salt and pepper. Arrange pumpkin, salad and avocado on plates. Spread the quark on top.