Make Marinade and marinade beef over night (recipe below).
Combine cilantro, chopped garlic and oil and blend to make a chimi churri sauce.
Add sour cream and onion sauce and mix together.
Fry fries until golden brown. Place on a plate, top with tomato strips, caramelized onion and cheese. Melt the cheese, then top with sour cream mixture and chopped cilantro.