2 tablespoons vegetable oil, divided
1 lb sirloin steak, cut into strips
salt, to taste
black pepper, to taste
½ red onion, sliced
1 medium tomato, sliced
2 cloves garlic, minced
1 tablespoon aji amarillo paste
2 tablespoons soy sauce
1 tablespoon white vinegar
1 tablespoon fresh cilantro, chopped
1 lb french fries, cooked, hot
white rice, cooked, for serving, optional