Wash the radishes thoroughly under cold water, scrubbing gently to remove any dirt. Pat dry with a clean towel.
Using a sharp knife or a mandoline for uniform slices, thinly slice the radishes until they’re almost translucent. Aim for even thickness to ensure consistent texture and presentation.
In a small bowl, squeeze fresh lemon juice—about 2 tablespoons—and add a pinch of salt and a tiny pinch of sugar if using. Whisk the mixture until well combined; it should smell bright and citrusy.
Pour the lemon dressing over the sliced radishes. Gently toss with tongs or a spoon until all the slices are evenly coated with the vibrant dressing. Let the radishes sit for about 5 minutes to absorb the flavors and soften slightly.
Taste the radishes and adjust the seasoning if needed—add a little more lemon juice or salt for brightness. Drizzle with a tablespoon of good olive oil for added richness.
Sprinkle chopped herbs like dill or chives over the salad if desired, for a fresh herbal note. Finish with a generous crack of black pepper just before serving to add a subtle spicy kick.
Transfer the dressed radishes to a serving plate or bowl. Give everything a gentle final toss to ensure an even distribution of dressing and herbs. Serve immediately to enjoy the crisp, bright bite of the radishes.