Whether this is old news or new news I don't know, but it's good news to me.
Until the last few days, two-word page titles typically had the site title added on in SERPS (for my own sites anyway). This was possibly affecting the page rankings by diluting the keywords. This seems to have stopped. Now, when I search for two-word phrases only those two words are shown as the title.
Interesting; it looks like some of the page titles that Google changed months ago are back to the ones I originally specified. Which is good.
But this is a strange one; I've had a turkey recipe that's been circulating around the net for over twenty years. Ranks fairly well for various phrases; the title tag is pretty straightforward. But this year, for almost every query I've tried, Google has added a big NETMEG on the end of the title. Not any of my domains (no TLDs) - just NETMEG.
That's kind of weird. I feel like I've been tagged.
It might have picked that up from the title of your blog page which links to the recipe page which ranks.
In my case the words added by Google to various page titles were the same as the home page title and the WordPress 'Site Title'. The latter is revealed only in the RSS and Atom Feed titles in document heads. I'd been thinking of removing those feeds for that very reason but there's no need to now.
I continue to feel that Google is testing variations, not only of its types of title rewriting, but also of the specific title change as applied to a page.
In some cases I've seen, I've felt Google is trying to shift a searcher's perception of the kind of page it is, perhaps to gauge searcher intent... or more precisely, to apply their own perception of the kind of page it is via a title grabbed from within the page or an inbound link (and then to test that).
But in others, it appears Google is just trying to make the title more attractive to the searcher by adding the query phrase to the title.