Sulfenic acids.

[richardw]

This past summer i ended up processing quite a few different alliaceae variates by rubbing out the seed by hand,its seems that some have more sulfenic acids in the seed heads than others,the last lot of seed i did was perianal leeks and man they were so strong it even left a taste in the mouth,i would have to close my eyes while i was doing it,the kids who were in a different part of the house ended up getting running eyes.
The perianal leek is far stronger than the annual as well as the onions.

[flowerweaver]

Now you know how to run off unwanted company! I just tasted my first Babbington perennial leeks, which I grew from bulbils, and they are really strong in flavor. I'll have to remember that when cooking.

[richardw]

I'm now looking forward to growing the perennial leeks from seed instead of bulbils,whether they turn out the same will be interesting.
I much prefer the flavour of perennial leeks than the modern leek.

[flowerweaver]

Me too. It's turned coolish and I just made some potato leek soup-- yum!