Combine the chicken, cornstarch and egg white in a large bowl with the soy sauce, sesame oil and white pepper and mix well. Refrigerate for 15 minutes.
Heat the oil in a wok or saucepan to 165C and fry the basil leaves (watch out, they may spit – I add them to the saucepan and quickly cover it with a lid for about 30 seconds until the spitting settles down) for about 1 minute until the basil is crisp, then remove from the oil. Increase the heat of the oil to 180C and fry the chicken in batches for about 4 minutes per batch or until just cooked through.
Heat a wok over high heat and add 1 tbsp of the frying oil. Fry the garlic, onion and green peppercorns for about 1 minute, then add the sauce ingredients and ½ cup of stock or water and bring to a simmer. Simmer for 3 minutes, then add the chicken and toss to coat for a further minute until the sauce is thickened and coating the chicken. Remove the chicken to a serving plate and scatter the basil leaves around to serve.
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