The article concerns the research of the herb Common Agrimony (Agrimonia eupatoria L.) use in the kvass manufacture, because the plant has a high content of flavoring and biologically active substances (flavonoids, tannins, arbutin, etc.). Researchers used standard, adopted in the brewing and soft drinks industry test methods and methods of processing obtained results. To produce kvass with the best quality characteristics, a man has to use Agrimonia eupatoria L. extract. In order to obtain

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... extract with the maximum amount of flavoring and biologically active substances (polyphenolic substances, ascorbic acid) a man must macerate 3-5 mm cut grass using purified water as a solvent in a ratio of 1:10 at a temperature of 40 ± 3 °C for 5-6 hours. Agrimonia eupatoria L. extract is an opaque brown liquid with a weak greenish tint, weakly expressed sweet-apricot aroma and taste; the mass fraction of dry substances is 3.0 ± 0.1 %; acidity – 2.5 ± 0.2 units; the content of polyphenolic substances is not less than 13.5 mg / 100 cm3; the content of ascorbic acid – not less than 4.5 mg / 100 cm3 . The authors developed kvass technology, including the preparation of kvass wort and Agrimonia eupatoria L. extract separately, its blending, fermentation, cooling, clarification and bottling. Based on the organoleptic and physical and chemical parameters obtained during the study, the researchers recommended the optimal ratio of kvass wort and Agrimonia eupatoria L.: 90:10 – 80:20. They developed regulated quality indicators of the new kvass: appearance – a transparent foaming liquid with opalescence, without foreign inclusions; color – brown with greenish tones; aroma and taste – refreshing, sweet and sour, bread, with light tones of Agrimonia eupatoria L. extract. The use of an aqueous extract from the herb Agrimonia eupatoria L. in the kvass production enables to get products with original organoleptic characteristics