koláče" - sweets from bakeries. The Czech kolač is a pastry filled with poppy seeds, fruit jams, nuts or sweet cheese. Most Czech families have their own secret koláč recipes which have been passed down through the generations.
Before century, all leavened bread was sourdoughbread, since they thought it was the yeast giving the bread the sour taste. Today we are able to produce yeast without lactobacillus which actually gives the sour taste.