Okay this product is of high interest to me! I have a 30 yr old vine and have 4 bushels of concord grape to process every year. I use a stock pot and potatoe masher..

Do you just steam the grapes and the juice stains as it steams?

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Yessir. That's exactly how it works. I'd guess we had a 75-80% volume reduction just from the steaming, no mashing or pressing at all until I squeezed the last tablespoon or so out of the leftover pulp. Started with roughly a gallon of grapes and ended with 3 quarts of juice.