Clean the mushrooms, wash and halve them. Heat oil in a pan. Fry the mushrooms for 3-5 minutes until golden brown. In the meantime, put spinach, milk and stock in a pot and bring to the boil over medium heat, stirring occasionally. Remove mushrooms from the pan. Add shrimps and 2 tablespoons of water to the pan and cook over medium heat.
Drain the mozzarella balls and cut them in half. As soon as the soup is boiling, add the mushrooms, prawns and sauce to the soup and possibly season with salt, pepper and a little nutmeg. Arrange the soup on plates. Add mozzarella balls. Garnish with chili flakes. Serve with wholemeal crissini