Step 1

Preheat oven to 350 degrees.

Step 2

Arrange walnuts in a single layer on a baking sheet and toast until golden and fragrant, about 8-10 minutes. Let cool completely.

Step 3

In a medium bowl, whisk together mustard, honey, shallots, lemon zest, and juice. Continue whisking and slowly drizzle in olive oil until emulsified. Season with salt and pepper to taste.

Step 4

In a large bowl, toss Brussels sprouts, apples, and chives with the dressing. Transfer to a serving dish and garnish with toasted walnuts.