Marinate pork with salt and sugar for at least 15 minutes.

Prepare all vegetables by slicing and dicing.

Measure out the black bean paste, water, sugar, and cornstarch for the sauce.

Heat a pan on medium-high heat, add oil, and cook the pork cubes until browned. Set aside.

Boil diced potatoes until soft, then strain.

Boil noodles until tender, drain, and set aside.

Sauté the onion and bok choy until softened. Add the cooked potatoes.

Add the black bean paste to the vegetables.

Add water and sugar to the sauce and bring to a boil.

Thicken the sauce with cornstarch.

Add the cooked pork back into the sauce.

Serve the sauce over the cooked noodles.