Grind A. Heat oil in a wok and fry A until fragrant and oil appears on surface. Put in large prawns and stir fry for 3 minutes until prawns are cooked. Dish out the prawns only and leave aside. This will prevent prawns from being overcooked. Pour in coconut milk and bring to a boil. Put in fish cake slices. When gravy boils again, add prawns and salt.
To serve, put a little thick rice vermicelli into individual serving bowls. Garnish with bean sprouts, cucumber and mint leaves. Pour hot gravy with prawns and fish slices over this.