I learned of this dish from my son who has been in China for the past 3 years. He said I had to try it. Im not sure its exactly what he had, but sounded similar to what he described. The only changes I made were , I left the heat out ( my wife doesnt like spicy, so no chili's or hot pepper). I substituted in some regular red pepper so Id still have a hint of pepper flavor. I also doubled the liquid ingredients ( Soy sauce, vinegar, stock and also sugar. It seemed like my potatoes may have been larger than what the recipe expected, so wanted to stretch the sauce a bit. I also had to adjust the salt at the end.
The potatoes are cooked, yet still have a little firmness to them.
https://thewoksoflife.com/sichuan-stir-fried-potatoes/