Clean, peel and cut the carrots into pieces. Peel and finely chop the onion. Heat the oil in a pot and fry the onion in it. Add the carrots and steam for 3-4 minutes. Season with salt and pepper.
Deglaze with broth and bring to the boil. Cook over medium heat for about 15 minutes. Peel 2 oranges so that the white skin is completely removed. Remove the fillets from the parting skins with a sharp knife.
Collect the juice. Squeeze the rest of the orange and measure out approx. 1/8 l juice. Remove approx. 1/4 of the carrots from the stock with a skimmer. Puree the remaining carrots with a blender. Stir in orange juice.
Add the rest of the carrots, orange fillets and peppercorns to the soup and warm it up. Season to taste with sugar, salt and pepper. Serve in soup bowls with a dollop of crème fraîche.