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Jason Barber invented his Black Cow vodka after wanting to diversify the produce from his 250-strong herd, supported by his “deep personal interest” in the spirit.

The vodka is made entirely from the milk of grass-grazed cows and nothing else.

It is made after separating the milk into curds and whey, with the whey fermented into a beer using special yeast that converts the milk sugar into alcohol.