I already make Greek yoghurt using my Instant Pot and use Yeo Valley's natural organic yoghurt as a starter, I use UHT milk so I can do a cold start process.
I have bought Yeo Valley Kefir yoghurt (ingredients Organic milk fermented with live kefir cultures) and am wondering if I can use this as a starter to make Kefir yoghurt as opposed to fermenting kefir grains. It maybe that this isn't going to turn out to be a genuine kefir yoghurt, but would it have the same live cultures of the Yeo Valley kefir yoghurt?
Basically we love the Greek yoghurt but would like the benefit of the kefir without me faffing around fermenting kefir grains which I have made kefir milk from in the past.