Mix the sauce mixture together (except cornstarch slurry) and set aside.
Coat each pork with potato starch and deep fry pork pieces until it turns golden brown and crispy. Drain and set aside.
In a wok, pour in the ready sauce mixture and give it a quick stir until it boils, add in capsicums and lychees. Stir in corn starch slurry to thicken sauce.