Combine and mix all sauce ingredients in a small bowl. set aside.
heat olive oil in a wok over medium heat.
add onions and cook until translucent in color.
add cabbage and cook for another 3 minutes.
add cooked yakisoba noodles and mix ingredients together and cook for another 2 minutes.
add sauce mixture into the wok and combine with the noodles.
Stir-fry for another 5 minutes.
transfer to serving plates/bowls and top with green onions.
Inspired by The Wanderlust Kitchen.