Historical clue formulations

• *French fries topper — 2013-09-10
• Dog's coat? — 2010-02-27
• Whopper topper — 2008-10-05
• 40-Across/34-Down topping — 2003-09-11
• McDonald's supply — 1998-08-21
• Whopper topper — 1998-04-23