Granger, who had a career spanning more than three decades, was remembered as the person primarily responsible for the global popularity of avocado on toast - so much so that he became widely known as the "godfather" of the snack.
He died in hospital in London with his wife, Natalie Elliott, and three daughters, Edie, Inès and Bunny, at his bedside.
Among those to pay tribute was Nigella Lawson, who wrote on social media that she was "heartbroken".
The TV chef wrote: "I find it impossible to find the right words when what's happened is so wrong. He was the loveliest man and the joy he gave us - whether through his food, his books, the spaces he made for us - came from the kindness, generosity and sheer shining exuberance of his very self."
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