Chop the radishes, tomatoes and cucumbers. Chop the green onions into small pieces.
Whisk together oil and vinegar. Put all chopped vegetables in a bowl and drizzle with oil and vinegar dressing. Add salt and pepper to taste. Mix until everything is combined.
Notes
Note: instead of using oil and vinegar dressing, you can use 1 tbsp of mayo or 1 tbsp of yogurt. Mayo or yogurt dressing also taste great with this crunchy radish salad.