Place the shrimps in a sieve and defrost at room temperature. Peel, wash and dice the carrots and potatoes. Peel and chop the onions. Peel and finely dice the ginger.
Heat 2 tablespoons of oil in a saucepan. Brown onions, ginger, potatoes and carrots in it. Sprinkle with curry and sauté. Deglaze with stock and vinegar, bring to the boil and simmer for about 25 minutes. Season with salt, pepper and sugar.
Wash the thyme and shake dry. Pluck the leaves from the stems, except for a little to garnish. Wash thawed shrimps, dab dry and possibly remove the intestines. Put 4 prawns on each skewer. Heat 2 tablespoons of oil in a frying pan. Fry the shrimp skewers in the oil for 2-3 minutes. Season with salt and pepper. Sprinkle with thyme leaves.
Take the soup from the stove and puree it. Season to taste with salt and pepper. Warm the milk and foam it up with a blender (or whisk). Chop the pistachios. Arrange the soup and one prawn skewer each. Put some milk foam on the soup and sprinkle with chopped pistachios. With the rest of the thyme garnish