A very low-calorie dish for the 5:2 diet or any other weight loss programme
Mix together the soy, oyster sauce, mirin, chilli, garlic, and cornflour.
Add the chicken and leave to marinade for at least 20 minutes and up to 8 hours
Heat the oil in a non-stick wok till smoking slightly
Add all the diced vegetables and stir-fry for 2 minutes
Add the chicken and marinade and stir-fry for a further 2-3 minutes till the chicken is cooked and the sauce is thickened. If necessary add water to keep the sauce thick but not burnt.
Put a tablespoon of the mixture into the centre of each iceberg lettuce leaf and if you like, garnish with a little fresh coriander
Wrap up into a roll and eat with your fingers