Peel the mangoes and cut them into small cubes.
Finely chop the red onion and add it to a mixing bowl.
Seed and mince the jalapeño.
Add the diced mangoes to the bowl with the onion and jalapeño.
Chop the fresh cilantro and mix it into the bowl.
Squeeze the juice of two limes over the mixture.
Season with salt to taste.
Gently mix all ingredients together.
Let sit for about 10 minutes to allow flavors to meld.
Serve immediately or refrigerate for later use.