Historical clue formulations

• Pizza order — 2015-09-23
• Pizza topper — 2013-01-13
• Certain link — 2012-05-06
• Link in the food chain? — 2011-09-29
• Chorizo or merguez — 2011-06-30
• It may be chain-linked — 2008-10-18
• Link — 2003-01-24
• Banger, in Britain — 1998-12-05