Preparation of the mash for mash fermentation by treading the grapes with bare feet in order to break up the berries for better extraction of the colouring agents and tannins. Even in ancient times, this was also an alternative to pressing, which is depicted in the tomb of the priest Chaemwese (1281-1225 BC) in ancient Egyptian Thebes. This is still common today in Portugal for the production of port wine in the shallow lagares (stone vats), as well as in France, Spain(Rioja) and Italy. The stampers stand with their arms hooked in a row and march slowly back and forth in the trough for up to two hours. The human foot is strong enough to crush the grape, but not so hard and unyielding that the grape seed bursts open. The bitter tannins contained in the seeds are undesirable.
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