Prepare onions and ginger by slicing thinly and setting aside.
1½ yellow onion, 1½ tbsp ginger
Heat up a wok or pan over medium-high heat with oil then cook onions and ginger for 3 minutes.
Add water, soy sauce, mirin, sugar, and dashi powder and allow it to come up to a boil.
1 cup water, ¼ cup soy sauce, ¼ cup mirin, 2 tbsp sugar, ¾ tsp dashi powder
Once the stock is boiling, add your sliced beef and continue to boil until beef is cooked through.
1 lbs sliced beef
Serve on rice, topped with an egg, green onions, and pickled ginger.
1 egg, green onions, pickled ginger