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Briefly blitz half the prawns, half the salmon, the spring onions, lemon zest and half the coriander in a food processor until it forms a coarse paste. Tip into a bowl, stir in the rest of the prawns and salmon, season well and shape into four burgers. Chill for 10 mins.
Mix the mayo and chilli sauce together in a small bowl, season and add some lemon juice to taste. Mix the lettuce with the cucumber, dress with a little of the remaining lemon juice and 1 tsp olive oil, then set aside.
Heat the remaining oil in a large frying pan and fry the burgers for 3-4 mins each side or until they have a nice crust and the fish is cooked through. Serve with the salad on the side or in toasted burger buns, if you like, with a good dollop of the spicy mayo.