For the sauce, chop coriander (cilantro) leaves and stems coarsely. Place in a tall jug or wide mouthed jar large enough to fit your stick blender. Add chilli, 4 tablespoons extra virgin olive oil and lime juice. Blitz using your stick blender until you have a pureed vibrant green sauce. If you don’t have a stick blender, use a food processor, regular blender of chop everything by hand.
Heat a medium frying pan on a medium high heat. Season fish with a pinch of salt. Add a splash of oil to the pan and cook fish for 2-4 minutes on each side or until browned and cooked through.
Fill 6 lettuce leaves or zucchini tortillas with the grated zucchini. Top with 1 piece of fish for each leaf / tortilla. Serve with hot sauce drizzled over.