<P> In the UK, McVitie's digestive is the best selling biscuit, with 80 million packs sold annually . Digestives are also popular in food preparation for making into bases for cheesecakes and similar desserts . </P> <P> Chocolate digestive biscuits are also available, coated on one side with milk, dark or white chocolate . Originally produced by McVitie's in 1925 in the UK as the Chocolate Homewheat Digestive, other recent varieties include the basic biscuit with chocolate shavings throughout (chocolate "chips" in the biscuit mix), or a layer of caramel, mint chocolate, orange - flavoured chocolate, or plain chocolate . American travel writer Bill Bryson described the chocolate digestive as "a British masterpiece". The McVitie's chocolate digestive is the most popular biscuit in the UK to dunk into tea . </P> <P> Digestive biscuits are similar enough to graham crackers that each can be used as a substitute for the other, such as in the United States where digestive biscuits are uncommon, and in places like Australia where Graham Crackers are unavailable . </P> <P> McVitie's Digestive Biscuits have become known among fans of the rock group The Beatles because they were the cause of an argument between George Harrison and John Lennon during a recording session for the group's 1969 album Abbey Road . The incident was recounted by recording engineer Geoff Emerick in his book Here, There, and Everywhere: My Life Recording the Music of The Beatles . According to Emerick, Lennon's wife Yoko Ono was in the recording studio and at one point helped herself to Harrison's box of McVitie's while the Beatles were in the control room listening to a playback of the song they'd just recorded . Harrison got angry at Ono, and his subsequent outburst caused Lennon to lose his temper in response . </P>

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