Preheat oven to 425°. Scrub beets and trim tops to 1 in.
Season with ½ teaspoon salt and 1 tablespoon of oil to coat.
Wrap in foil; place on a baking sheet. Bake 50-60 minutes or until tender.
Remove foil; cool completely.
Peel beets and cut into wedges.
In a small bowl, whisk remaining oil, orange marmalade, orange juice, vinegar, honey, mustard,
remaining salt and pepper until blended; stir in 1 tablespoon tarragon.
In a large bowl, combine arugula, salad greens and remaining tarragon.
Drizzle with vinaigrette and toss gently to coat.
Transfer to a platter. Top with orange sections and beets: sprinkle with cheese and pistachios.
Serve immediately.