Step 1: Soak the mushrooms in hot water for 30 minutes and cut them into strips. (Set aside).
Step 2: Heat a little sesame oil in a pan and fry the mushrooms.
Step 3: Add the chicken, ginger, garlic, leek, celery and stir.
Step 4: Add the fish sauce, soy sauce and chicken stock, simmer for 15 minutes then add the tomato and cook for another 15 minutes.
Step 5: Add the prawns.
Step 6: Coat the fish fillets in the salted cornflour, dip them in the beaten egg white then add them to the stock, leave to cook for 3 minutes then stop cooking
Step 7: Adjust the seasoning
Add the lemon juice, coriander and onion stems