Wash the radishes thoroughly and remove the tops and tails. Slice them into very thin rounds using a sharp knife or a mandoline.

Prepare the avocados by cutting them in half and removing the pits. Slice the flesh into bite-sized pieces and set them aside.

Place the radish slices and avocado chunks into a large glass mixing bowl. Add the thinly sliced red onion to the bowl as well.

In a separate small jar, whisk together the olive oil, fresh lime juice, salt, and black pepper.

Pour the dressing over the vegetables gently. Use a large spoon or your clean hands to toss the salad carefully.

Sprinkle the freshly chopped cilantro over the top right before serving. Adjust the salt or lime juice if necessary.

Serve immediately while the colors are bright and the textures are crisp.