Historical clue formulations

• Sandwiches that often contain tuna — 2025-01-06
• Oven-warmed sandwiches — 2024-02-26
• Goes soft — 2018-09-21
• Softens — 2017-05-31
• Goes soft — 2016-01-14
• Gets all gooey — 2016-01-05
• Hot deli orders — 2015-08-22
• Turns to mush — 2006-09-05
• Gets mushy — 2005-12-01
• "___ in your mouth, not ..." — 2001-02-27
• Turns from ice to water — 1999-01-25
• Goes soft — 1995-11-26
• Lunch sandwiches — 1994-02-13