Thin-cut beef steak simmered in tangy tomatillo green salsa with serrano peppers. A quick, high protein dinner that delivers fresh Mexican flavors for the whole family.
Pat the beef steaks dry and season both sides with kosher salt and black pepper.
Heat 1 tablespoon of vegetable oil in a large skillet over medium-high heat until shimmering. Sear the steaks in batches, 1–2 minutes per side, to brown but not cook through. Remove and set aside.
Add the remaining oil to the same skillet. Sauté the sliced onion until soft and lightly golden, about 3 minutes. Stir in garlic and cook until fragrant, 30 seconds.
Blend tomatillos, serrano peppers, and cilantro until smooth. Pour this mixture into the skillet; simmer over medium heat, scraping browned bits. Return seared steaks to the pan, nestling them in the sauce.
Cover partially; reduce heat to low. Simmer 10–15 minutes, or until beef is tender and the salsa has thickened, turning steaks once. Taste and adjust seasoning before serving.