SCHOOL LUNCH, Preparation United States Department of Agriculture Office of Information Lunches being sealed (heat shrink machine). Lunches in trays are covered with a plastic film, and passed through the heat shrink machine, which shrinks the film tightly around food and tray. This keeps the food clean and fresh for serving in parks and at other city sites. This food preparation is for the "Summer Feeding Program" for the city of Portland sponsored by USDA's Food and Nutrition Service.

Date is approximate.