Peel the mangoes and cut around the pit to chop the flesh into small cubes, which will release a sweet citrus aroma as you work.
Finely dice the red onion, aiming for small, even pieces that will blend smoothly into the salsa.
Mince the jalapeño, removing seeds if you want a milder flavor, and set aside.
Squeeze fresh lime juice over the chopped mango, onion, and jalapeño, giving the mixture a bright, citrusy scent.
Chop the cilantro finely and sprinkle it into the bowl, adding a fresh, herbaceous aroma that complements the sweet and spicy elements.
Sprinkle sea salt over the mixture, tasting and adjusting until the flavors are balanced and vibrant.
If desired, drizzle a small amount of honey or agave to enhance the natural sweetness of the mango, stirring gently to combine.
Stir everything together thoroughly, letting the flavors meld for about 10 minutes at room temperature.
Give the salsa a final taste and adjust seasoning if needed, then serve in a bowl with tortilla chips or as a topping for grilled dishes.