Preheat oven to 400°F. Roast radishes with oil, thyme, salt, and pepper for 20 mins.
Whisk vinaigrette ingredients together.
Combine arugula and herbs in a large bowl.
Toss warm radishes with the greens and vinaigrette.
Top with walnuts and crumbled feta. Serve immediately.
Notes
Use radish greens if they are fresh; they add a wonderful extra peppery kick.Ensure radishes are in a single layer for the best golden-brown roast.This dish is best served warm to allow the herbs to release their fragrance.Store radishes separately from greens if prepping in advance.