Sweet Pickled Onion and Watermelon Radish Salad

from http://winterridgefoods.com/whats-a-watermelon-radish/
Makes 4 cups

1 large Watermelon radish, sliced into thin rounds
1 small white onion, sliced into thin rounds
1/3 cup orange juice
2 Tbsp extra virgin olive oil
1/2 tsp sea salt
1/2 tsp pepper
2 Tbsp apple cider vinegar
splash of rice wine vinegar (optional – adds an extra layer of tart-sweetness)
Directions:
1. Place radish and onion slices in a large mixing bowl.
2. Add the remaining ingredients and toss well.
3. Refrigerate overnight to chill and meld flavors before serving.