500 grams moist smoked fish, (I used Gemfish)
600 grams waxy new potatoes, scrubbed
2 spring onions, thinly sliced
2 inner stalks of celery, thinly sliced
3 large gherkins, thinly sliced
¼ cup chopped flat-leaf parsley
½ cup sour cream
1 teaspoon Dijon mustard
1 clove garlic, crushed
1 tablespoon olive oil
1 tablespoon lemon juice
1 tablespoon horseradish sauce
1 teaspoon cold water
sea salt and freshly ground pepper
zest 1 lemon
tender inner celery leaves
extra chopped flat-leaf parsley
Dressing: Whisk the sour cream in a bowl until smooth then whisk in all the remaining ingredients and season. Add more horseradish if you prefer a spicier dressing.
Remove the skin and bones from the smoked fish and pull the fish into large chunks. Set aside.
Cook the potatoes in boiling salted water until tender. Drain and set aside. When cool, peel and cut into large chunks.
To assemble: Combine the fish, potatoes and remaining ingredients in a large bowl. Add the dressing and gently fold together. Transfer to a serving platter and scatter with the lemon zest, celery leaves, parsley and a grind of pepper.