What is "bistek"

Bistek ( Spanish: bistec) is a Mexican dish of pieces of salted and peppered sirloin, usually flattened with a meat tenderizing tool, covered in bread crumbs and fried. The dish is usually served in tortillas as a taco. In the Philippines, bistek Tagalog, a specialty of the Tagalog region, is typically made with onions and strips of sirloin beef slowly cooked in soy sauce and calamansi juice. It is known in the Spanish-speaking world as bistec encebollado or bistec tagalo.