2.Meanwhile, make buttermilk dressing: combine buttermilk, horseradish and parsley in a small bowl.
3.Coarsely grate potatoes into a medium bowl.
4.Heat oil in a large frying pan over medium heat; drop ¼ cups grated potato into pan, flatten with a spatula. Cook rösti, in batches, until browned on both sides. Remove from pan.
5.Layer rösti, salmon and rocket on serving plates; serve with buttermilk dressing.
Replace smoked salmon with smoked trout thinly sliced leg ham or rare roast beef.
Note
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