Drain the onion slices and add to the spinach along with the tangerine, grapefruit and beets. Drizzle the mustard dressing over the salad and toss well. Serve right away.

Roasted beets hit a tasty middle ground when you turn them into a salad with blue cheese, peppery arugula, crisp apples, and sunflower seeds, all tied together with a tangy lemon-chive vinaigrette.