A friend recommended this plant to me last spring, and in May I found a plant in my garden that looked very much like the picture in my book...
... but the leaves didn't taste of anything very much.
The other day I noticed these plants coming up again...
... and tasted a leaf (note: This method of plant identification is not recommended). This time I could taste both garlic and mustard quite distinctly, though neither was very strong. I wonder if the older plant I tried last year was just so much milder that I couldn't detect the distinctive flavours.
Having positively identified the plant, I picked a handful of leaves yesterday and added them to leftover soup (the leftovers being mostly mashed potato and gravy) along with nettles, celandine and a little ground elder, just because there's so much of it around at the moment. The soup was nice, though I can't say I particularly tasted garlic and mustard, but then if I'd added those two spices separately, I wouldn't expect the flavours to stand out in a soup like that.
I think this one's a useful herb.
Also harvesting this week:
Leek (just one, so small that I previously mistook it for grass)
Also drinking this week:
Foraged food challenge summary page here.