Food / Help with info on a peculiar vodka/cream drink. [13]

Hi folks!

I was raised by my Polish grandparents and have the fondest memories of a peculiar drink my grandfather use to make. I've searched high an low on the net but have not found anything worthwhile.

My recollection is that he used to mix vodka with cream, lemond rind, and vanilla, and let it curdle. He would rebottle the now milky infused vodka, and eat the curd. Does this ring a bell for anyone? Any info would be greatly appreciated.