Marinate the sliced beef with 2 tbsp Bachan’s Japanese Barbecue Sauce for 15 minutes.
In a small bowl, whisk the remaining Bachan’s with the cornstarch and 2 tbsp water. Set aside.
Heat up some oil in a pan over medium high heat. When hot, add the sliced onion and cook, stirring, until soft and tender, about 3-4 minutes.
When the onions are soft, add the marinated meat and cook, flipping as needed, until slightly seared.
Add the Bachan’s sauce mix to the pan and bring to a simmer over medium heat, stirring, until the sauce thickens, turns glossy, and coats the meat.
Remove from the pan and serve with rice and sesame seeds as desired.
