In a bowl, combine soy sauce, brown sugar, sesame oil, minced garlic, grated ginger, rice vinegar, and gochujang. Mix well to create the marinade.
Add the thinly sliced beef to the marinade, ensuring all pieces are coated. Let it marinate for at least 15 minutes (or up to 2 hours in the fridge for deeper flavor).
Heat 1 tablespoon of vegetable oil in a large skillet or wok over medium-high heat.
Add the marinated beef to the skillet in a single layer. Stir-fry for about 3-4 minutes until the beef is browned and cooked through. Remove the beef from the skillet and set aside.
In the same skillet, add the remaining tablespoon of vegetable oil. Add the sliced onion and bell peppers. Stir-fry for about 2-3 minutes until the vegetables are tender but still crisp.
Return the cooked beef to the skillet with the vegetables. Stir everything together and cook for an additional minute to heat through. Garnish with chopped green onions before serving.
Serve the beef bulgogi over cooked rice.
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