Heat oil in a heavy-based deep-sided frying pan or wok. Add minced garlic, onion and ginger and mix thoroughly. After about 1 minute add the remaining veg and stir through, now add the king prawns along with the salt and sugar.
After 1 minute add the oyster sauce and a splash of wine, mix thoroughly and add a splash of stock to create a sauce. To thicken mix the cornflour in a tiny bit of water to create a paste and pour over the now bubbling ingredients, constantly stirring at the same time.
Finish with a dash of sesame oil.