in batches, making sure not to overcrowd the pan. Sear for about 1–2 minutes per side, just until browned.
Transfer the beef to a plate and set aside.
3. Cook the Mushrooms and Onion
Reduce the heat to medium and add the butter.
Add the sliced onion and cook for 3–4 minutes, until softened.
Add the mushrooms and cook for another 5–7 minutes, stirring occasionally, until golden and their moisture has cooked away.
Add the minced garlic and cook for about 30 seconds.
4. Make the Sauce
Sprinkle the flour
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