Ingredients
3 teaspoons whole-grain mustard
3 tablespoons fresh lemon juice
1/4 cup extra-virgin olive oil
Coarse salt and freshly ground pepper
1 medium celery root, peeled into ribbons (6 cups)
1 red onion, thinly sliced
2 ounces smoked mackerel, flaked
1/4 cup chopped fresh parsley
Preparation
Combine mustard and lemon juice. Add oil in a slow, steady stream, whisking constantly, until combined. Season with salt and pepper.
Toss dressing with remaining ingredients.