Add lime juice and red pepper flakes, if desired. (Red pepper will make it spicier!)
Cover and cool in the fridge for at least 3 hours so the flavors can mix and the salsa will get cold.
Serve and enjoy!
This is best eaten on the first day. Leftovers on day two are okay, but it doesn't keep for very long! You can add them to other recipes to use it up once it isn't as fresh as you'd like, so don't throw those leftovers out!