Fast food is a type of mass-produced food designed for commercial resale and with a strong priority placed on "speed of service" versus other relevant factors involved in culinary science. Fast food was created as a commercial strategy to accommodate the larger numbers of busy commuters, travelers and wage workers who often did not have the time to sit down at a public house or diner and wait for their meal. By making the speed of service the priority, this ensured that customers with strictly limited time (a commuter stopping to procure dinner to bring home to their family, for example, or an hourly laborer on a short lunch break) were not inconvenienced by waiting for their food to be cooked on-the-spot (as is expected from a traditional "sit down" restaurant). The fastest form of "fast food" consists of pre-cooked meals kept in readiness for a customer's arrival (Boston Market rotisserie chicken, Little Caesars pizza, etc.), with waiting time reduced to mere seconds. Other fast food outlets, primarily the hamburger outlets (McDonald's, Burger King, etc.) use mass-produced pre-prepared ingredients (bagged buns and condiments, frozen beef patties, vegetables which are prewashed, pre-sliced, or both; etc.) but the hamburgers and french fries are always cooked fresh (or at least relatively recently) and assembled "to order" (like at a diner).