3/4 cup walnut halves
1 pound Brussels sprouts
1 small sweet onion, very thinly sliced
2 ounces finely grated Pecorino Romano
1/4 cup lemon juice
2 1/2 tablespoons extra-virgin olive oil
Salt and pepper, to taste
Preheat your oven to 350 F. Arrange walnuts in a single layer on a small baking sheet and bake until lightly toasted, about 6-8 minutes. Make sure to keep your eyes on the walnuts as they cook as they will go from nicely toasted to burnt quickly.
Trim the tough ends off the Brussels sprouts. Use the blade attachment of your food processor to shave the a thin as you can.
Toss all salad ingredients in a large serving bowl. Serve chilled or at room temperature.