Wash beef brisket, and cut it into bite-size pieces.

Heat a frying pan, and pour in a small amount of oil. When the oil reaches 70°, add the beef brisket and fry, stirring, for 5 minutes. Reduce the heat. Add the ginger slices and chili peppers to the skillet; keep to stir-fry until fragrant. Then pour in the soy sauce and stir.

Increase the heat, add a small amount of boiling water to the pan, and bring to a boil. Skim off the foam, cover the pan with a lid, turn the heat low, and leave the beef to simmer for 40 minutes.

While the beef brisket is braising, peel and wash the potatoes, cut them into chunks, and fry them in another pan allowing the surface of the potatoes to brown slightly.

Add the roasted potatoes to the skillet with the beef and continue to braise for another 10-15 minutes. Add salt and sugar, stir well, and remove from the heat.