Must (from the Latin vinum mustum, “young wine”) is freshly pressed fruit juice (usually grape juice) that contains the skins, seeds, and stems of the fruit. The solid portion of the must is called pomace; it typically makes up 7–23% of the total weight of the must. Making must is the first step in winemaking.
Source : https://www.flickr.com/photos/skipmoore/21279081240/in/pool-17918700@N00
