For the Yuca:
Place the yuca in enough water and let it cook until soft. Once ready remove the fiber that has in the center. Place in a stand mixer, and mix to cool a little. Add the egg yolks, cheese and butter and mix to combine.
While the Yuca is cooking, make the sauce. In a pot heat to medium low heat, add oil, onion, garlic and tomatoes, cook until tomato is soft, add the tomato sauce, salt, pepper, cilantro and ketchup, cover and cook for 5 minutes.
Heat up enough oil to fry the fritters. Know Grab about 2 tablespoons of the yuca dough, make a tortilla shape and add a teaspoon of the cheese close and cover with egg white and immediately in breadcrumbs, place in a plate and make the rest. Fry for 3 minutes or until golden brown.
Serve warm with some sauce on top.