Ah... the pieces fall into place. Dad hated garlic, and was deathly allergic to sulpha drugs. Duh. I've known for decades that alliums contain sulpher compounds....
Sometimes it just takes a half century for all the pieces to fall into place and I can feel appropriately dumb.
Thanks for this article.
/johnny
He probably hated onions too, as garlic and onions are in the same plant family.