Chop the chicken into bite-sized pieces. Toss with corn flour, salt, oil, and an egg.
Air fry at 180 C for 20-25 mins in an even layer. Turn the pieces once halfway through. Alternatively, drizzle on a little more oil and bake them in the oven, or pan-fry in a large pan. Meanwhile make the sauce: mix all the ingredients together in a bowl. Taste and adjust seasoning.
Add the sauce to a large, wide pan. Keeping the pan over a medium flame, toss the chicken pieces in the sauce to coat the chicken evenly.
The sauce will thicken to a sticky glaze in a few mins. Take the pan off the heat when this happens.
Add chopped lettuce to your serving plate. Heap the chicken pieces over the lettuce. Top with sesame seeds and spring onion tops. Serve warm or at room temp.