Wash and thinly slice the radishes. Place the slices in a bowl of ice water for 10 minutes to make them extra crispy. Drain well and pat dry.
In a small bowl, whisk together the olive oil, white wine vinegar, Dijon mustard, and sugar. Season the dressing with salt and pepper.
In a medium bowl, combine the drained radishes and chopped parsley.
Pour the vinaigrette over the radish mixture. Toss gently to coat all the slices evenly.
Serve immediately as a simple side dish. For a traditional French presentation, serve the salad alongside softened butter and coarse salt for spreading on bread.
Notes
Soaking the radishes in ice water helps reduce their peppery bite and maximizes crispness.
If you prefer a slightly creamier radish salad dressing, add 1 teaspoon of crème fraîche to the vinaigrette ingredients.
This salad pairs well with grilled chicken or fish for a light dinner.