Take a bowl and add 1 tbsp oyster sauce, 1 tbsp Worcestershire sauce, 1 tsp tomato ketchup, ½ tbsp sake, ½ tsp sugar, 1 pinch ground black pepper and 1 tsp toasted sesame oil. Whisk until well combined, this is the yakisoba sauce.
In a smaller separate bowl, mix 1 tbsp Worcestershire sauce, 1 tbsp oyster sauce, 2 tbsp tomato ketchup, 1 tbsp honey and 1 tsp Japanese soy sauce (koikuchi shoyu). This is the okonomi sauce for the topping so set aside for later.
Yakisoba
Heat a wok on medium-high and add 1 tbsp cooking oil. Once hot, add 200 g yakisoba noodles (pre-steamed), fry until slightly crispy and then transfer to a plate.
In the same wok, add 100 g ground pork with a sprinkle of salt and pepper and fry until browned.
Add 30 g onion and 30 g green cabbage and stir fry until softened to your liking.
Push the meat and vegetables to one side and add the noodles to the empty space. Drizzle the homemade yakisoba sauce from earlier over the noodles only, and mix until evenly covered.
Stir fry everything together for 1-2 minutes and then remove from the heat.
Use kitchen scissors to cut the noodles (this will make it easier to eat with the omelette).
Omelette
Preheat a 20cm non-stick pan on medium and add 1 tsp cooking oil. Spread it around with kitchen paper to ensure an even finish.
While you wait for it to heat up, whisk 6 egg, 2 tbsp milk and 1 tsp olive oil in a bowl until combined, then pour through a sieve to ensure it's smooth.
Once the pan is hot, pour 1 portion (2 eggs worth) of the mixture into the pan and tilt to spread it evenly. Whisk continuously until it starts to set, then stop whisking and allow it to cook until half-done.
Tilt the pan occasionally to ensure the egg is going up the edges (this will make it easier to fold).
Once half-cooked, place one portion of the yakisoba noodles over one half of the omelette.
Carefully peel one edge of the omelette away from the pan using the spatula and fold it in half over the noodles.
Push the spatula underneath the omelette to make sure it's not stuck, then flip or slide it onto a plate. Top with your homemade okonomiyaki sauce and a drizzle of Japanese mayonnaise, then sprinkle with aonori (dried green seaweed powder), red pickled ginger (benishoga) or your toppings of choice.
Repeat with the rest of the egg mixture and yakisoba, making sure to lightly grease the pan between each omelette. Enjoy!