Step 1

To make the sauce, drain the pineapple in a sieve over a bowl and keep all the juice – you should have about 150ml/5fl oz. Put the cornflour in a large bowl and stir in three tablespoons of the pineapple juice to make a smooth paste. Add the remaining juice and 150ml/5fl oz water, then stir in the soy sauce, vinegar, sugar, ketchup and chilli flakes until thoroughly combined. Set aside.

Step 2

Cut each chicken breast into eight or nine even pieces. Heat a tablespoon of the oil in a large non-stick frying pan or wok and stir-fry the onion and peppers for two minutes over a high heat. Drain the water chestnuts and cut them in half horizontally.

Step 3

Add the remaining oil and the chicken to the pan and stir-fry for two minutes until coloured on all sides. Add the garlic, ginger, pineapple chunks and water chestnuts and stir-fry for 30–60 seconds.

Step 4

Give the cornflour and pineapple mixture a good stir and add it to the pan with the chicken and vegetables. Stir well, season with some ground black pepper and bring to a simmer. Cook for 4–6 minutes until the sauce is thickened and glossy and the chicken is tender and cooked throughout, turning the chicken and vegetables a few times. Serve with a small portion of rice.