Until relatively recent history, apples weren't for eating. In fact, they were often too bitter to just munch on. Instead, for thousands of years, people would press them for the juice and leave it to ferment, letting it bubble away until it turned into boozy hard cider, according to the National Apple Museum.

The apples are first washed and then crushed to release the juice. The juice is then strained to remove any solids, but it is not filtered, so it retains its natural cloudiness. Some cider producers pasteurize their cider to extend its shelf life, while others prefer to keep it unpasteurized for a more natural taste.