I'm not sure what this taste is, but DH doesn't taste it. I recall it once
or twice previously in the last few years. This time I took note of the
winemaker and see that it is wine from a reputable winemarker, so I will not
mention it, as it smells like barnyard dung. I'm wondering if it is the
grenache, although I've not noticed it in other grenache/syrah.

It is just a hint in the taste. You can't smell it.

Yes, I know barnyard dung -- born a hillbilly.
Dee Dee