wine vinegar makes it a perfect match for fish.
Cut the potatoes into cubes but keep the
skin on. Cook in a pan of simmering salted
water until just tender, about 10-15 minutes,
and then drain. Add back to the pan with the
parsley and some seasoning and crush lightly
with a masher or the back of a fork.
splash of white wine vinegar and a slug of
olive oil and gently mix in. Add more of each
if it needs it.