Historical clue formulations

• Bit on a bun — 2025-11-14
• Bun topper — 2023-04-15
• Bit on a bun — 2020-03-07
• Hamburger bun topper — 2015-04-21
• Kind of bun — 2002-12-21
• Kind of oil — 2000-04-15
• It's on a roll — 1996-10-18