Prepare Green Onion Oil: Fry sliced green onions in abundant oil until fragrant, then remove.
Cook Pork and Vegetables: In the green onion oil, sauté pork belly, diced onion, and zucchini. No salt needed as black bean paste adds saltiness.
Add Sauces and Seasonings: Add a little Korean soy sauce for fragrance, black bean paste, and optional sugar. Mix well.
Add Water and Boil: Pour water to cover the ingredients and bring to a boil. Adjust sweetness with sugar if desired.
Thicken with Starch: Mix starch with water and add to the sauce to thicken.
Prepare Noodles: Cook noodles according to package instructions, rinse to remove excess starch.
Serve: Place noodles in a bowl, top with the black bean sauce, and garnish with julienned cucumber.