How to Make It
Prepare the Dressing: Whisk together all ingredients in a small bowl. Refrigerate until ready to use.
Prepare the Salad: Arrange watermelon radish, orange, grapefruit, small radishes, and avocados on a serving platter (or divide evenly among 4 plates). Sprinkle evenly with pomegranate arils, pistachios, scallions, salt, and pepper.
When ready to serve, drizzle the Salad with a little of the Dressing. Pass the remaining Dressing at the table.