1.Heat a wok or large saucepan on high. Add curry paste and half of coconut milk. Cook, stirring, for 2-3 mins.
2.Add remaining coconut milk, lychees, 3/4 cup reserved lychee syrup, pineapple, soy and fish sauces and kaffir lime leaf. Simmer for 5 mins, until pineapple is just tender. Add duck and simmer for another 5 mins.
3.Stir in tomatoes. Garnish with thai basil and extra shredded kaffir lime leaf. Serve with rice.
A barbecued duck is easy to source if you live near a Chinatown, but it you have trouble finding one, you could use barbecued chicken in this recipe.