I finally found skyr with a hechsher. (I have been looking for it ever since II saw a show about Icelandic foods a few years ago).Skyr is a thick, creamy yogurt. It has the creaminess of Greek yogurt (I love Chobani) but is a little less tangy. I found it in Gourmet Glatt (Cedarhurst)- the brand name is Siggi's and it's under OU supervision. The vanilla was delicious.