BK Chicken Tenders made their debut in a menu revision and expansion in 1985 to address the absence of a chicken-based finger product akin to McDonald's Chicken McNuggets. The product had to be temporarily withdrawn because of limited availability of chicken meat; it was re-introduced about six months later. Originally made with sliced fillets of chicken, the product was changed to a formed chopped-chicken product several years later. In 1987, BK rolled out the Burger Bundles, a pack of six mini burger sliders, similar to White Castle was brought back later as the "Burger Buddy". Fish Tenders were introduced to complement Chicken Tenders during a menu expansion in 1989. The new fish product, sold in the same style of container as the Chicken Tenders, was an order of fish sticks with Tartar sauce for dipping. Portion sizes were similar to those of the Chicken Tenders. Fish Tenders were discontinued in 1990.