Subscribe and choose a new cookbook
The perfect Christmas gift for you or a loved one
Mix together the onion, vinegar, sugar and a pinch of salt. Leave to pickle while you dice the beetroot and roughly chop the nuts.
Divide the watercress and smoked mackerel between six plates. Scatter over the beetroot and nuts, then top with a cluster of the pickled onions. Whisk the oil into the pickling vinegar, then drizzle the dressing around the outside of each plate.