Cook the french fries: Preheat your oven per the package instructions. Once hot arrange the frozen french fries evenly on a baking sheet. Then bake them for the amount of time indicated on the package instructions, or until golden brown and crispy. Set the cooked french fries aside till later
Prep remaining ingredients: While the fries are baking let’s prep all of the ingredients for the stir fry. Slice the beef into thin strips against the grain. Add it to a bowl, sprinkle on the salt & black pepper, and mix to combine. Slice up the onion, and tomatoes and set aside on a plate. Mince the garlic, & ginger and set them aside on another plate. Stir together the ingredients for the sauce in a bowl or cup. And finally, roughly chop the cilantro and set it aside in a small bowl.
Cook the steak: Get out a wok or large walled pan. Pour 2 tablespoons of oil into it and place it over high heat. Once the oil is hot and smoking toss in the sliced steak and stir-fry it for a couple of minutes or until it is mostly browned up. Transfer the cooked steak to a plate or bowl and set it aside.
Finish the dish: Pour another tablespoon of oil into your wok/pan and keep it over high heat. Toss in the minced garlic & ginger and saute these for 30 seconds making sure that you don’t burn them. Then add the sliced onion and stir fry it for a minute or two. Next, add the tomatoes and stir fry for another minute. Follow this up by adding back the beef along with the prepared sauce. Stir fry for another minute or two so that the sauce reduces, and the onion & tomatoes become soft but not mushy. Finally, add the cooked french fries and give everything a good mix.
Serve the lomo saltado on a plate with a side of rice and garnished with fresh cilantro. Enjoy!