Use fresh green cucumber and radish. You can use smaller tender English cucumber and leave peels on. Use red onion for a zing; you can substitute white onion or omit if preferred. Serve immediately for crisp veggies or marinate 10-15 minutes for more flavor. Salt and pepper work well, add minced garlic or chili flakes for heat. Fresh herbs like dill, cilantro, or mint complement nicely.