Peruvian Steak Stir-Fry with Onions and Tomatoes (Lomo Saltado)

Peru’s lomo saltado, a quick stir-fry of soy-marinated beef, tomatoes and onions, is part of chifa cuisine—Asian-influenced dishes created by indentured Chinese workers in the late 19th century. For our take, we developed deeper flavor by mixing ground cumin into the soy sauce marinade. Tenderloin is often used here, but we preferred sirloin tips (also called flap meat) for their meatier flavor as well as lower price. And we seared the meat instead of stir-frying. Readily available jalapeño peppers made a good substitute for the traditional yellow ají peppers. If you prefer little to no spiciness, halve and seed the jalapeño before slicing it into half rings. Classic lomo saltado is frequently served over french fries; your favorite, frozen or otherwise, would be a good choice here. Steamed rice is an equally good accompaniment.