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Combine all the salsa ingredients together in a bowl and season with salt and pepper then set aside to let the flavour develop.
In a separate large bowl, mix together the spiralized courgette, spring onions, coriander stalks, lime zest, cumin and flour (you may need to cut some of the longer courgetti in half). Stir in the beaten egg and season with salt and black pepper.
Working in 2 batches, heat half the oil in a non-stick frying pan over a medium heat. Shape the fritters with your hands then then fry for 2–3 mins on each side until golden. Serve warm with the tomato salsa.