Make stir-fry udon noodles.
Set aside the prepared stir-fry udon and grill the pork belly.
Add garlic, green onions, kimchi, and bean sprouts to the grilled pork belly and stir-fry.
Add the step 3 mixture and step 1 together and stir-fry.
Add chili powder, sesame oil, sesame seeds, and potato starch slurry, then finish stir-frying.