Ingredients

  • 3 3/4 cups brussels sprouts, halved, cored, leaves separated
  • Kosher salt
  • 1/2 cup walnut halves, divided
  • 2 1/2 tablespoons unsalted butter
  • 1 tablespoon walnut oil plus more for drizzling
  • 1 medium shallot, minced
  • 3 tablespoons plus 2 teaspoons Champagne vinegar
  • 1 1/4 teaspoons Dijon mustard
  • Pinch of sugar
  • Freshly ground black pepper
  • 1/2 medium head of radicchio (about 5 ounces), cored and thinly sliced
  • Parmesan (for shaving)
  • 3/4 teaspoons finely grated lemon zest

Method

  • Blanch brussels sprouts in boiling salted water for 30 seconds; drain and immediately transfer to a large bowl of ice water to cool. Spin in a salad spinner to dry leaves (or pat dry with kitchen towels). DO AHEAD:
  • Crush 2 1/2 tablespoons walnuts with a rolling pin or the side of a knife; set aside. Melt butter with 1 tablespoon oil in a small saucepan over low heat. Add shallot and crushed walnuts; cook, stirring frequently, until shallot softens, about 2 minutes. Whisk in vinegar, mustard, and sugar. Remove vinaigrette from heat; season to taste with salt and pepper. DO AHEAD:
  • Place brussels sprouts and radicchio in a large bowl. Pour walnut vinaigrette over brussels sprouts mixture and toss to coat well. Transfer to a serving dish. Using a vegetable peeler, shave cheese over. Sprinkle with lemon zest and remaining walnuts. Drizzle with walnut oil.