Sauce: in a bowl, mix together all the sauce ingredients and set aside
Enoki mushrooms: remove the woody base of the enoki mushrooms and break into 12 even portions. Clean until running water thoroughly and let dry completely.
Assemble rolls: working with 1 piece of thawed meat slice at a time - lay it flat and place 1 bundle of enoki mushroom on top. Roll and wrap the enoki with the beef tightly and set aside. Repeat with the rest of the beef and enoki mushrooms.
In a pan over medium heat, add in a drizzle of oil and the onion slices. Stir fry until the onion slices are slightly golden. Neatly place the beef rolls on top of the onion and pour in your sauce. Cover and let the beef cook in the sauce for 3-4 minutes or until the beef is half-cooked.
Uncover and drizzle in the beaten eggs. Cover for 2 minutes to let the eggs cook. Top with coriander or green onions, and sesame seeds. Serve on a bed of rice.