Finely chop the cabbage and green onion.
Cut the beef brisket into bite-sized pieces.
Beat the eggs in a bowl.
Add the chopped cabbage and green onion to the eggs and mix well.
Heat some oil in a pan and stir-fry the beef brisket first.
When the meat is about halfway cooked, pour in the vegetable and egg mixture.
Cover with a lid and cook on low heat.
Once the bottom is cooked, flip it over and cook the other side.
Drizzle sauce and mayonnaise on the finished okonomiyaki.