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Yes Sir Stephen, they do put them on top of hamburger buns sometimes.

Ah! Then I know them Lady Jo, but in all honesty I don't know if I like them very much. In my country construction days I had a job in a small town with only one hotel and the chef there made fresh buns for breakfast every morning. The buns were served with steam coming out of them and a portion of what he called devilled kidneys. I have never tasted anything likewise since.
Blessings