I’ve been perfecting this recipe for three years now. The first year, the buns were good — but still a bit too firm. The second year, they were better, but not quite as soft as I wanted. On the third try, after a few more tweaks, I can finally say these buns are truly soft and tender! 
You can even watch my step-by-step guide in the Terevisioon TV clip. (Video is in Estonian)
*You can substitute milk with oat milk or even water.