1 medium celery root (about 1 lb / 450 g), peeled and cut into thin matchsticks 1 crisp apple (such as Granny Smith), cut into thin matchsticks 1 small shallot, finely minced 2 tbsp (30 ml) cornichons, finely chopped 1 tbsp (15 ml) capers, drained and chopped 1 / 3 cup (80 ml) mayonnaise 1 tbsp (15 ml) Dijon mustard 1 tsp (5 ml) whole-grain mustard 1 tbsp (15 ml) fresh lemon juice 1 tsp (5 ml) lemon zest 2 tsp (10 ml) white wine vinegar 1 tbsp (15 ml) fresh parsley, chopped 1 tsp (5 ml) fresh tarragon, chopped (optional) 1 / 4 tsp (1 g) sugar 1 / 2 tsp (3 g) kosher salt, plus more to taste Freshly ground black pepper, to taste 16 small butter lettuce or Belgian endive leaves 2 tbsp (30 ml) toasted walnuts, finely chopped (for garnish)
Place the celery root in a bowl and toss immediately with the lemon juice to prevent browning. In a separate bowl, whisk together mayonnaise, Dijon, whole-grain mustard, lemon zest, white wine vinegar, shallot, cornichons, capers, parsley, tarragon (if using), sugar, salt, and a few grinds of black pepper until smooth. Add the apple and celery root to the dressing and fold to coat evenly. Taste and adjust seasoning with more salt, pepper, or vinegar as needed. Refrigerate for 15–20 minutes to chill and meld flavors. Arrange the lettuce or endive leaves on a platter. Spoon the remoulade into each leaf and sprinkle with toasted walnuts. Finish with a light grind of black pepper and serve chilled.
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