Make sure you have all of your ingredients cut and within reach. Also make sure your pot of rice is cooked before starting to stir fry. In a medium pot or wok, Preheat oil to 360 Fahrenheit. Use enough oil to comfortably submerge the potatoes. Do not fill the pot or wok more than 1/3 of the way up to avoid splashing hot oil.
Add the par-cooked (or frozen) french fries to the hot oil.
Once potatoes are added, temperature will drop. Adjust heat to maintain around 350 Fahrenheit while cooking. Cook potatoes while stirring until golden brown and crispy, about 5 minutes.
Remove potatoes from hot oil and drain on a plate lined with paper towels. Season with salt.
Place the hot potatoes and some cooked rice on a warm plate.
Now you can start the actual stir fry.....
Place a large saute pan or wok on the hottest burner you have.
Preheat about 2-3 tablespoons of oil over the highest heat possible. You will stay at maximum heat the whole time.
Once oil just begins to smoke, add the beef to the pan and allow to brown, stirring or tossing occasionally. A few controlled flare ups throughout this whole process is a good thing. BE CAREFUL NOT TO BURN YOURSELF.
Cook beef approximately 30 seconds.
If using a home stove, remove beef from pan now, and set aside. Clean out the pan and get very hot again with fresh oil before proceeding to next step
Add onions and stir fry for an additional 20 seconds
Add tomatoes and stir fry for an additional 20 seconds
Add sauce around the edges of the pan or wok, allow to sizzle and continue tossing or stirring for 15 seconds.
If you removed beef from pan, add it back in now and stir fry for 20 seconds before moving to next step.
Add cilantro and scallions.
Stir fry about 20 more seconds until everything has come together.
Turn off heat. There should be some sauce at the bottom of the pan at this point. Adjust seasoning with a little salt if you like.
Serve saltado and its juices on top of the french fries and enjoy!