Soak the brains in cold salted water for 20 minutes. Drain and rinse them. Remove the membranes and place them in a saucepan with the vinegar and salt. Cover with fresh water and bring to the boil. Reduce the heat and simmer for 5-10 minutes. Leave to cool in the pan.
Mix together the ingredients for the dressing and season to taste. Remove the brains from the pan