What type of food service purchases fully prepared individual portions and requires no on-site production?

The type of food service that purchases fully prepared individual portions and requires no on-site production is known as assembly serve. In this model, food items are pre-prepared and often come in individual servings, allowing for minimal preparation and quick serving at the point of consumption. This approach is particularly advantageous for facilities that lack the resources for extensive food preparation or where efficiency is paramount.

In assembly serve, the focus is on reconstituting or assembling pre-made items, which streamlines operations and reduces labor costs. It is commonly used in settings such as healthcare facilities or schools, where consistency and speed in meal service are essential.

Conventional food service typically involves preparing meals on-site, meaning that food production is a key component and does not align with the description given. Delivery focuses on delivering meals that may or may not be fully prepared, and it often involves some level of on-site preparation or heating. Commissary service refers to a system where large amounts of food are prepared in one location and then transported to various sites for service, which also does not fit the requirement of no on-site production.