Winter Citrus Salad

Make the dressing: In a small bowl, whisk together the olive oil, orange juice, Dijon mustard, and salt and pepper. Assemble the salad on a platter by arranging the radicchio, arugula, and half of the citrus segments. Drizzle with a few spoonfuls of the dressing. Layer the fennel, avocado, red onion, and the remaining citrus onto the salad. Top with pine nuts and goat cheese if using; sprinkle with salt and pepper, and serve.