Heat the vegetable oil and sesame oil in a wok, frying pan or large skillet over medium-high heat.
1 tbsp vegetable oil, 1 tsp sesame oil
Add the onions and stir fry for a few minutes until they start to turn transparent, then add the carrots and cabbage and stir fry for a minute or two until they start to soften.
1 onion, 1 carrot, 100 g cabbage
Add the yakisoba noodles and stir fry for a few minutes, using your spatula to toss and separate the strands. Once noodles start to become crispy, add half the yakisoba sauce and stir quickly to coat all ingredients evenly.
400 g yakisoba noodles, ½ cup yakisoba sauce
Add the remaining yakisoba sauce and stir fry until all ingredients are cooked.
½ cup yakisoba sauce
Slice hot dog buns in half, stopping just before you cut them all the way through, so they'll hold in the noodles.
8 hot dog buns
Stuff the cooked yakisoba into cut the cut hot dog buns and garnish with optional pickled ginger, spring onion and aonori.
beni shoga / red pickled ginger, seaweed flakes / aonori, spring onion