Coat the seafood in the sesame oil, chilli and kaffir lime leaves. Combine the lime juice, rice syrup, fish sauce together in a bowl. Boil a pan of lightly salted water and add the noodles. Bring to the boil then reduce the heat and cook for 3 - 4 minutes. Once cooked, drain the noodles and rinse thoroughly under cold water prevent the noodles sticking together.
Heat a wok and add the seafood mix. Stir fry for 5 minutes or until the fish is cooked through. Add the watercress, shallots and stir fry for 1 minute before removing from the heat. In a large bowl, combine the seafood, noodles, coriander, mint, Spanish onion cucumber and dressing and serve.
Note: The ancient Greeks believed watercress could cure a deranged mind. It belongs to the cruciferous family (related to broccoli and cabbage). Cruciferous vegetables re reputed to have anticancer properties.