Papas rellenas translates to stuffed potatoes. It is a peruvian dish (also made in Colombia) consisting of mashed potatoes stuffed with seasoned ground meat and deep fried. It is usually accompanied with a Sarza Criolla, or an aji sauce. Cuban and Puerto Rican versions consist of potato balls stuffed with seasoned picadillo. I usually use half potatoes and half yuca, or whatever I have left over from a previous meal.