1.Dust fish with cornflour, shaking off excess. Heat oil in a wok or frying pan on high. Cook fish in batches for 2-3 minutes, until golden and cooked. Drain on paper towel. Set aside.
2.Add onion, capsicum, cucumber and carrot to same pan. Stir-fry for 2 minutes.
3.Toss through pineapple pieces with combined pineapple juice, soy and chilli sauces. Stir-fry for 1-2 minutes, until boiling.
4.Reduce heat and simmer for 3 minutes, stirring, until sauce has thickened slightly. Toss fish through sauce for 1 minute. Serve with steamed rice.
1/2 cup pineapple juiced could be used in place of drained juice.