This is a great salad and easy to make. 
I saw these beautiful watermelon radishes at the farmers market.
Just fill a bowl with your favorite greens mixture. I used baby spinach, kale, finely minced, a mix of salad greens, and parsley. On top, I placed cucumber, carrots, celery and the watermelon radish slices. 
Dressing
1 Tbsp  Apple cider vinegar
3  Tbsp  olive oil
Mix together. 
Season with salt and pepper.

 
                    