Peel and finely chop the onion. Peel, wash and cut the potatoes into small pieces. Melt the fat in a saucepan. Brown the potatoes and onions in it. Add stock and vinegar. Bring to the boil, cover and cook for about 20 minutes
Wash, clean, quarter and seed the tomatoes. Cut the flesh into small cubes. Wash herbs and shake dry. Pluck off the leaves and chop
Finely puree the soup. Stir in cream and season to taste with salt, pepper and sugar. Add shrimps, diced tomatoes and about 2/3 of the herbs to the soup, bring to the boil briefly. Arrange the soup, sprinkle with the remaining herbs