Serves 2; can be doubled.
For the dressing:
Zest of 1/2 navel orange, plus juice of 1 orange
1/4 tsp Dijon mustard
1 large spearmint leaf
1/2 tsp honey
Pinch black pepper
Pinch kosher salt
3 Tbsp extra-virgin olive oil
For the salad:
2 cups baby arugula leaves
2 cups diced watermelon
3-4 small cherry or Juliet tomatoes, diced
4 Tbsp crumbled feta cheese
In a blender, combine the orange zest and juice, mustard, mint, honey, pepper and salt. Whiz for a few seconds, and add the oil. Blend until the dressing is emulsified and the color is a pretty yellow-orange. Set aside.
Arrange half of the arugula on each plate. Top with half of the watermelon and tomatoes. Sprinkle half of the cheese on each plate, and drizzle the dressing over all. (If you have extra dressing, you can store it in the refrigerator for several weeks.)
Serve cold.