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Pictures of food, once the preserve of books and Good Housekeeping magazine, have proliferated online, becoming more sophisticated and spawning countless viral memes and hashtags: 2014 was the year of #kale and 2015 was the year of #avotoast. What a dish looks like as you scroll down is integral to its viral potential. Colour is important. Green is certainly up there (see #greenjuice), as is pink: pomegranate seeds gild thousands of Insta-hits. Nigella Lawson recently declared that she is…
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