Prep the Beef: Season the beef cubes generously with salt and fresh cracked black pepper.
Mix Sauces: Combine Worcestershire, teriyaki, oyster sauce, and chili flakes in a bowl.
Cook Garlic: In a hot pan with oil, sauté half of the thinly sliced garlic until golden and crispy, then set aside—this will be used for garnishing.
Sauté Mushrooms: In the same pan, sauté mushrooms until just tender, 5-7 minutes.
Sear the Beef: Increase the heat, add a tablespoon of olive oil. Once the pan is hot, add the beef cubes and sear on one side for about 2 minutes. Then stir in the remaining garlic and pre-mixed sauce. Continue to cook for an additional 2 minutes.
Finish with Butter: Lower the heat, add cold butter to the pan, and stir it in to coat the meat and emulsify the sauce.
Serve: Serve this immediately and garnish with the crispy garlic and freshly chopped scallions