Cut the bok choy in half lengthwise, wash it, and blanch both the udon noodles and bok choy in warm water.
Add a little cooking oil to a pan and grill the pork belly slices.
Add chopped green onion, 2 spoons of minced garlic, and 4 spoons of chili powder to the pan and stir-fry.
Add the noodles, bok choy, mung bean sprouts, 4 spoons of oyster sauce, and 2 spoons of sugar, then stir-fry everything together.