1- Peel and slice the garlic and Jerusalem artichokes. Sauté them for 10 minutes over low heat in 2 tablespoons of olive oil.
2- Add the chestnuts, cream, water and poultry stock cube.
3- Cook for 25 minutes over low heat. At the end of cooking, reserve 2 tablespoons of broth.
4- Shell the prawns, keeping the tip of the tail.
5- Dry them, salt and pepper. Pass them through the egg white and dried fruit powder.
6- Fry them in 1 tablespoon of oil and butter.
7- Pass the soup through a vegetable mill.
8- Beat the egg yolks with the 2 tablespoons of reserved broth then mix into the pot with the soup over low heat without boiling.
Serve immediately and sprinkle with roughly ground hazelnuts.
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