Combine ingredients for the stir fry sauce in a bowl. Give everything a good mix to combine, then set aside for later.
To make the batter, whisk together the plain flour, rice flour, baking powder and salt in a large mixing bowl. Add in the chilli powder, garlic, ginger, egg white, soy sauce and 100ml (3½ fl oz) of water. Mix to combine well. Now add the chicken pieces and ensure they’re all well coated.
Fill a wok or large saucepan with vegetable oil one-third of the way up. Turn onto medium-high heat. The oil is hot when a wooden chopstick or the end of a wooden spoon will bubble when placed in the oil – total Asian mum trick!). Working in batches, carefully remove the chicken pieces from the batter and lower into the hot oil. Cook for 2-3 minutes or until golden brown and crispy. Transfer to a cooling rack set over paper towel to drain. Repeat with the remaining chicken.
Place a clean wok over high heat. Add 2 tablespoons of vegetable oil then add the onion and stir-fry for half a minute. Then add the capsicum and cashews and stir-fry for a minute. Now add the dried chillies and stir-fry for another half a minute. Add the chicken, stir-fry sauce, fresh red chilli and spring onion. Toss until well combined. Serve with steamed rice, if using.
