In a bowl, combine the sliced steak with all the steak marinade ingredients. Mix well and let marinate for at least 10 minutes.
In a separate bowl, whisk together all the sauce ingredients and set aside.
Heat 1 tablespoon of oil in a large non-stick skillet over medium heat. Once hot, add the marinated steak and sauté for about 3 minutes, until browned and just cooked through. Remove from pan and set aside.
In a same pan, add a little bit more oil if needed. Add onions and sauté for 2-3 minutes. Add garlic and cook for another minute until fragrant.
Add the tomatoes and cook for about 1 minute, just until slightly softened but not mushy. Pour in the prepared sauce, then return the steak to the pan along with the French fries. Toss everything together quickly until well coated.
In a blender, combine all the ají verde ingredients and blend until smooth.
Serve immediately over steamed rice and garnish with chopped cilantro. Drizzle with ají verde if desired.