To make the gremolata, mix all of the ingredients together and set aside. For the fritto misto, put the plain flour, cayenne pepper and some seasoning on a plate and mix well. Dry the fish and seafood really well with kitchen towel then in batches, dust with the seasoned flour, transfer to a sieve and shake off any excess flour.
Heat a little of the oil in a large non stick frying pan, when the oil is hot cook the fish for a few minutes until golden and crisp, sprinkle with a little salt then keep warm whilst you cook the rest of the seafood. Don't over crowd the pan and make sure your oil is hot so that the end result isn't soggy! Serve the fritto misto with gremolata sprinkled on top and a dollop of mayo.
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