Varenets

Varenets , sometimes anglicised as stewler or simmeler, is a fermented milk product that is popular in Russia. Similar to ryazhenka, it is made by adding sour cream (smetana) to baked milk. Varenets is a fermented dairy drink with a caramel taste and creamy color. Varenets was traditionally produced by baking milk in a Russian oven and fermenting it with sour cream. Commercially available cultured varenets is milk that has been pasteurized and homogenized (with 0.5% to 8.9% fat), and then inoculated with a culture of Streptococcus thermophilus to simulate the naturally occurring bacteria in the old-fashioned product.

Source: Wikipedia