Hi Aidan,
I've always been a big fan of on-site SEO, so when it comes to this sort of thing, I've spent a lot of time doing trial and error with all sorts of combinations. Here are my thoughts based on my feedback:
- "keyword | keyword" is better than "keyword|keyword".
- Writing a meta title that reads as a sentence is better than "keyword | keyword"
So for example, I might actually go for:
"Great Chocolate Cake recipes for Christmas"
Instead of actually trying to stuff all the keywords in. If you're desperate for 3 keywords on a page, then make use of other on-site factors to achieve this, stuffing them into the title won't get you the desired result - at least, that's what my experience shows.
Hope that helps