Add the sliced radishes and onion to a medium bowl. Pour in the chili oil, soy sauce, rice vinegar, maple syrup, sesame oil, and sesame seeds.
Toss well until everything is evenly coated and glossy.
Serve immediately or let sit for 5–10 minutes to deepen the flavor. Enjoy!
Video
Notes
Storage Keep leftovers stored in an airtight container or mason jar in the refrigerator. Consume within 2 days to enjoy the best taste and texture. You can also store the radish and onion slices separately from the chili oil mixture and then just toss them right before serving to maintain the crisp texture of the veggies.