Use a mandoline or sharp knife to slice sprouts paper-thin rather than chopping—this creates a delicate texture that allows the vinaigrette to penetrate and soften the leaves without cooking, resulting in a tender yet crisp salad.

Dry-toast walnuts in a 350°F oven for 8-10 minutes until fragrant and golden, which intensifies their nutty richness and prevents them from becoming soggy when tossed with the dressing.

Use Granny Smith or Pink Lady apples for their acidity and crisp texture, and slice them just before tossing to prevent oxidation—toss with a squeeze of lemon juice immediately to maintain their bright appearance and fresh bite.

Whisk together Dijon mustard, honey, and lemon juice first before slowly drizzling in olive oil while whisking constantly—the mustard acts as an emulsifier to create a creamy, cohesive dressing that coats the salad evenly rather than separating.

Refrigerate the dressed salad for at least 30 minutes before serving; the cold temperature allows the Brussels sprouts to gently soften while the flavors marry together, creating a more unified and sophisticated taste.