Heat 1 tablespoon oil in a frypan over high heat. Add cabbage and 1 tablespoon water stir-fry for 30 seconds. Remove cabbage from frypan and place on a serving platter.
Heat the remaining 1 1/2 tablespoons oil in the frypan over high heat. Place the garlic and prawns in the pan and stir until garlic is lightly browned and the prawns turn pink. Add chilli, onion, coriander, soy sauce and remaining water to the frypan. Stir-fry for 10 seconds. Pour the hot mixture onto the cabbage.