Method

• Marinate the beef: In a bowl, combine the steak, soy sauce, vinegar, garlic, cumin, aji amarillo, red pepper flakes, salt, and pepper. Marinate for at least 30 minutes.
  
  
• Cook the fries: Cook the frozen French fries according to package directions.
  
  
• Cook the steak: Heat 1 tablespoon of olive oil in a large skillet or wok over high heat. Add the marinated steak and cook until browned and slightly charred. Remove from the skillet and set aside.
  
  
• Sauté the vegetables: In the same skillet, heat the remaining olive oil. Add the onion and cook until softened. Add the tomatoes and cook until they begin to break down.
  
  
• Combine: Return the steak to the skillet and cook for a few more minutes, until the flavours are well combined.
  
  
• Serve: Serve the Lomo Saltado over a bed of hot French fries. Garnish with chopped cilantro.