In a blender or jar with a tight fitting lid, combine the orange juice, olive oil, vinegar, honey, salt and pepper. Puree or shake to combine.
In a large bowl, toss together the arugula, spinach, orange segments, feta, pistachios, and mint.
Drizzle the salad with some of the vinaigrette and gently toss to combine, taking care not to break up the feta. Taste and add more dressing if desired. Divide among four plates and serve. Extra dressing can be stored in the refrigerator.
You can adjust the salad ingredients to taste.If the honey is a thicker variety, warm it in a small dish in the microwave for a few seconds before adding it to the vinaigrette to prevent clumping.