In a small bowl, combine red onion and 3 Tablespoons of apple cider vinegar. Set aside for 10 minutes. This removes the bitter onion bite. You could also substitute sliced green onions and skip this step.

In large bowl, whisk together extra virgin olive oil, dijon mustard, 2 Tablespoons of apple cider vinegar and salt and pepper to taste. Add arugula and toss to coat.

On a large platter, arrange orange slices. Top with arugula, red onion, pepitas and goat cheese crumbles. Serve immediately.