You can make this side dish in advance of serving, as the flavors will meld over time. Just make sure to mix up the components again right before serving.
This side dish will keep well without any problems if kept covered in the fridge for a day or two.
Add some Feta cheese to the mix here, if that sounds appealing to you.
Add the mixture here to some romaine lettuce wraps, and you have a really healthy entrée!