• 275ml/½pint white wine vinegar
• Sea salt
• 1 large mackere

Put the vinegar into a pan with a heaped teaspoon of sea salt and heat until lukewarm, then remove from the heat. Put the mackerel fillets into a tight-fitting dish and cover with the vinegar. Set aside for the next 7 hours… Yes, so start early! When the time is up, drain off the vinegar and set the