Smoked Mackerel, Radicchio and Hot Potato Salad

• 450 g (1 lb) new potatoes, scrubbed
• 1 smoked mackerel

Cook the potatoes in boiling salted water for 15-20 minutes or until tender. Meanwhile, remove the skin and bones from the mackerel and cut the fish into even slices. Tear the radicchio leaves into manageable pieces. Make up the dressing by beating the ingredients together in a bowl.

When the potatoes are ready, drain them, cut them up roughly and put them back in the warm pan. Place ov