Recipes the Rowan appears in a network at first glance quite a lot. Upon closer examination turns out to be: replicated essentially the same recipe, and does not kvass, and ash mash. I any brew – classic grain, beet, berry, Apple, etc. – are made on the basis of the leaven. However, even in this case, the first product can get a little "brajkovac", i.e. favoring the yeast and hop. Then its better just to merge. Well, if you do so, as described below, you definitely will mash, though vigorous, very drunken: "the Berries to be cleaned from twigs, rinse, then put in a glass bottle or a keg, pour boiled warm water, add yeast, a good seal and put on 5-6 hours in a warm place. In a well-fermented brew, add sugar to taste or honey. Now the kvass is ready for use". Ready-to-eat mash, but it does not brew. This stuff filled the space of the Internet. Kvass can also contain some number of degrees, it can be slightly intoxicating, and I also usually warn, but still he's not a mash.