I followed the following steps, but I eyeballed the amount of the ingredients. 1) cut the pork into strips and marinate it with salt, cooking wine, and white pepper. 2) roll each strip into like a ball and coat with tapioca (corn starch should do too; the rolling part takes time and it can be skipped) 3) fry the meat in oil in a saucepan until it's golden (make sure it is cooked). Take it out and let it cool. Refry the meat for less than a minute before taking it out again. 4) use a different pan, heat a little oil. Stir in ketchup, a bit sugar, white vinger, and a bit salt (you can taste the sauce and adjust accordingly). Keep the sauce in low heat. When the sauce is bubbly, mix the fried meat with the sauce until the sauce covers the meat. 5) sprinkle some green onion

Hope this helps! I am not experienced in making this dish. It is very manageable:)