Possible Clues:

• Unidentifiable protein
• Unappetizing cafeteria offering
• Not-quite-identifiable cafeteria food
• Much-joked-about cafeteria offering
• School-lunch entree, to kids
• Cafeteria entrée, facetiously
• Facetious name for a school cafeteria staple
• Cafeteria staple
• School lunch item, facetiously