Cut the pumpkin into slices, remove the seeds. Peel and dice pumpkin. Peel and chop onions. Peel 3 apples, quarter them, remove seeds and cut into large pieces. Heat 4 tablespoons of oil in a saucepan.
Brown the onions, apples and pumpkin in it. Deglaze with stock, bring to the boil and simmer for about 20 minutes. Roast the pumpkin seeds in a pan without fat until golden brown, remove. Cut remaining apple into quarters, remove seeds and cut into small cubes.
Heat 1 tablespoon of olive oil in a frying pan. Steam apple cubes for 1-2 minutes until translucent. Mix sour cream and cream until smooth. Puree the soup and season to taste with salt, pepper, a little sugar, nutmeg and vinegar. Arrange in soup bowls.
Stir the sour cream mixture into streaks. Sprinkle with pumpkin seeds and apple cubes. Garnish with oregano. Serve with grain baguette.