Brussels Sprouts with Walnut Vinaigrette

Directions

1. 1.

   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: Can be made 2 days ahead. Wrap in a kitchen towel, transfer to a resealable plastic bag, and chill.

2. 2.

   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: Can be made 2 days ahead. Transfer to a container, cover, and chill. Let vinaigrette come to room temperature before serving.

3. 3.

   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.