Wash the radishes and cucumbers under cool running water. Thinly slice the radishes and cucumbers into uniform rounds of about 1/8 inch thick and set aside in a mixing bowl.

Rinse the mint leaves, pat dry, and roughly chop. Add the chopped mint to the bowl with the sliced radishes and cucumbers.

In a small bowl, squeeze the juice of a lemon (about 2 tablespoons). If using, add olive oil and whisk until combined.

Drizzle the dressing over the salad ingredients in the mixing bowl and gently toss until coated.

Season the salad with salt and black pepper to taste, tossing gently to incorporate.

Transfer to a serving platter and serve immediately.