How to Make It
Whisk together oil, vinegar, mustard, salt, and pepper in a small bowl. Place Brussels sprouts in a large bowl. Add 1/2 cup of the dressing, and toss to combine. Let stand at room temperature until softened, 30 minutes to 1 hour.
Add pecans, pear slices, and pomegranate arils to Brussels sprouts, and toss to combine. Drizzle with remaining dressing just before serving.