I’ve mentioned piima-cultured cream on Hearth Cricket now and then. Piima (pronounced peema) is a Scandinavian yogurt-like culture I mix with whipping cream from a local dairy to make something like a thick sour cream (only sweeter). We use it as a condiment on potatoes and Mexican food, toss it with pasta or churn it into ice cream and butter (and yummy buttermilk!). It’s also mentioned in Something Borrowed, Something Bleu, along with other yogurt cultures and kefir grains.
Want to know more? Or purchase a culture to use yourself? Cultures for Health has it all, along with sourdough starters, cheese making kits, sprouting kits, kombucha mushrooms, and plenty of other ways to introduce more probiotics (and flavor!) into your diet.