Combine diced mango, minced jalapeño, minced red onion, lime juice, agave nectar, white wine vinegar, cilantro, cayenne pepper, and kosher salt in a medium mixing bowl. Allow to rest for 20-minutes.
Cover and refrigerate until ready to eat if not serving immediately.
Notes
Mangos will vary in their sweetness level depending on their quality and exactly how ripe they are. Add the vinegar and agave nectar a little bit at a time to make sure that you balance the sweetness of the mangos you are using. Continuously taste it as you are mixing to ensure that everything is perfectly balanced!