Juice obtained by pressing grapes; also known colloquially as must. It is the untreated or unfiltered product immediately after pressing and can also be referred to as "cloudy grape juice". In terms of wine law, however, there is a difference to grape juice. The latter is only produced through further treatment of grape must by preserving it against further fermentation.
It is also the starting material for the preparation of wine, sparkling wine, concentrated grape must, RCGM (rectified concentrated grape must). Grape must is also used for the production of various products such as churchkhela (dessert), hardaliye (drink), pekmes (grape syrup), petimezi (sweetener) and verjus (condiment). It is also permitted for sweetening wine in compliance with wine regulations.
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Markus J. Eser
Weinakademiker und Herausgeber „Der Weinkalender“