Wash and clean the zucchini, carrots and celery. Cut the zucchini lengthwise into thin slices. Cut out about 24 white and green stars with a small star cutter. Finely dice 1/2 carrot.
Simmer the stars and cubes in a little salted water for 2 minutes, remove and set aside. Dice the rest of the vegetables. Wash the thyme and remove the leaves. Heat the oil in a wide saucepan, sauté the diced vegetables and thyme for 5 minutes.
Deglaze with 1 litre of water, add granulated vegetable stock. Let simmer for about 15 minutes. Puree finely with a chopping stick. Season to taste with salt and pepper. Pour the soup into preheated plates, add a dash of crème fraîche to each plate, stir in lightly and sprinkle with the stars, carrot cubes and crab meat.