Peruvian Lomo Saltado

Step 1
Preheat the oven to 425 degrees F (220 degrees C).

Step 2
Arrange frozen French fries in a single layer on an ungreased cookie sheet.

Step 3
Bake in the preheated oven until light golden, 22 to 24 minutes.

Step 4
Meanwhile, heat 2 tablespoons oil in a frying pan over medium-high heat. Season sliced beef with salt and pepper. Cook and stir beef in hot oil until just cooked and the juices release. Use a slotted spoon to transfer beef to a plate.

Step 5
Cook and stir onions in beef drippings in the pan until translucent, 3 to 4 minutes. Stir in tomato and aji amarillo; cook until tomato softens. Pour in vinegar and soy sauce.

Step 6
Add French fries and beef to the pan. Cover and cook until beef is cooked through, about 3 minutes. Season with salt and pepper; sprinkle with chopped parsley to serve.