1. To make dressing:mix orange juice, vinegars, honey, oil, ginger, salt and pepper flakes in blender.
2. Blend 30 seconds.
3. In medium bowl:combine orange slices, bell pepper, onion, and dressing.
4. Marinate for at least 15 minutes.
5. Toss spinach with dressing mixture and sprinkle roasted almonds on top.