½ onion
1 carrot
3 shiitake mushrooms
2 green onions/scallions
4 cabbage leaves
¾ lb sliced pork belly (340 g; or your choice of meat and/or seafood)
2 Tbsp neutral-flavored oil (vegetable, canola, etc)
freshly ground black pepper
1 package Yakisoba Noodles (one package comes with 3 servings, 16-17 oz or 454-480 g)
4-6 Tbsp yakisoba sauce (Recipe follows)

Yakisoba Sauce (Makes ½ cup (8 Tbsp))
4 Tbsp Worcestershire sauce (Japanese brand "Bulldog" Worcestershire sauce (Usuta-so-su, ウスターソース) is milder and less sour than Lea & Perrins Worcestershire sauce.
4 tsp oyster sauce (If you're allergic to shellfish, use LEE KUM KEE Vegetarian Stir-Fry Sauce)
4 tsp ketchup
2 tsp soy sauce
2 tsp sugar (Add more sugar, if needed)

Toppings (optional)
Aonori (dried green seaweed)
pickled red ginger (beni shoga or kizami beni shoga)