Start by peeling and coring the pineapple.
Dice the pineapple into small, even pieces.
Finely chop the red onion and jalapeño.
Rinse and chop the cilantro, removing any tough stems.
In a mixing bowl, combine the diced pineapple, onion, jalapeño, and cilantro.
Squeeze the lime juice over the mixture.
Add salt and black pepper to taste.
Gently toss the ingredients together until well mixed.
Let the salsa sit for at least 10 minutes to allow flavors to meld.
Serve immediately or refrigerate for later use.