Nigel Slater’s mackerel with pear and red onion recipe - The Guardian

Nigel Slater’s mackerel with pear and red onion recipe - The Guardian
Nigel Slater’s mackerel with pear and red onion recipe  The Guardian

Peel and finely dice 1 medium-sized red onion. Put it into a stainless steel pan to which you have a lid, pour in 150ml of red wine vinegar and bring to the boil.