Fillet a super fresh mackerel and slice it into 4mm slivers. (Maximum three hours out of the water but on the boat would be incredible.) Feel the pieces carefully and cut out any pin bones. Add a slug of raspberry vinegar, a squeeze of lemon, a sprinkle of finely chopped green chilli and salt and pepper. Mix with your fingers and leave to marinate for ten minutes
Serve.
That's it. Stunning.
Andrew found the raspberry vinegar in Waitrose.
