In a small jar or bowl, combine the fresh orange juice, champagne vinegar, Dijon mustard, honey, minced shallot, olive oil, and a pinch each of salt and black pepper. Shake or whisk the mixture vigorously until thoroughly combined to create a smooth vinaigrette. Set aside until ready to serve.
Spread the assorted salad greens evenly onto a large round serving platter or in a spacious serving bowl, creating a base for the salad toppings. If preferred, place a small bowl of prepared vinaigrette (from Step 1) in the center for easy serving.
Scatter the orange sections, apple slices, pomegranate arils, sweetened dried cranberries, crumbled feta cheese, and toasted chopped pecan pieces evenly over the salad greens (from Step 2). Serve immediately with the citrus vinaigrette from Step 1 on the side or lightly drizzled over the salad. I like to toss the fruit and nuts just before serving to keep everything fresh and crisp—avoid assembling too far ahead as the greens can become soggy.