Autumn Salad with Horseradish Vinaigrette

Name: Autumn Salad with Horseradish Vinaigrette
Ingredients: For the salad:; 3/4 pound brussels sprouts, halved lengthwise; 3/4 pound cauliflower florets; 3 cups 1/2-inch cubes of butternut squash; 2 tablespoons extra-virgin olive oil; 1 tablespoon white balsamic; 3/4 teaspoon sea salt; 1 teaspoon freshly ground pepper; 1/2 teaspoon ground nutmeg; A few pinches of cayenne; 1 cup cooked white beans, rinsed and drained; 1/2 cup pomegranate seeds; 2 cups arugula; For the vinaigrette:; 1 tablespoon prepared horseradish; 1 clove garlic; 1/2 shallot; 1 teaspoon honey; 2 tablespoons white wine vinegar; 1/4 cup extra-virgin olive oil; Sea salt and freshly ground pepper; Handful of chives and/or parsley (optional)