I was just reading up on Tabasco sauce and noted that they age their mashed peppers in ex-bourbon casks for 3 years. Then I had the obvious idea: what would Irish whiskey aged in these ex-Tabasco barrels be like?
Turns out I'm not the first to think of it. This article mentions the same thing in the context of the Scotch Whisky Association putting the kibosh on unconventional casks.
Has it ever been tried? It would be a noble experiment.