1. Whisk together first 6 ingredients. Gently toss together arugula, radishes, and half of olive oil mixture in a large bowl. Arrange on a serving platter with salmon and avocado. Serve immediately with remaining olive oil mixture.
*1 (5-oz.) package spring mix, thoroughly washed, may be substituted.
Note: For testing purposes only, we used Echo Falls Smoked Salmon at one tasting and Woodsmoke Provisions at another.