Heat up half of the oil in a pan or wok set over a medium high heat.
Season the chicken with salt and pepper, and fry it in batches on both sides until cooked through - that shouldn't take more than 5 minutes per batch.
Remove the chicken from the pan and set aside.
In the same pan, add the remaining oil, and add the peeled and chopped garlic, ginger and spring onions, and stir fry them for 30 seconds.
Add the mangetout and baby corn, and stir fry them for a further 1 minute.
Return the chicken to the pan, add the cashew nuts, pour over the soy sauces, sesame oil and rice vinegar.
Combine the water with the cornflour to get a smooth consistency, and pour it over the rest of the ingredients, giving it a good stir.
Place a lid on the pan for 1-2 minutes, then give it another stir, and garnish with fresh parsley.
Serve hot!