Preheat outdoor grill on medium-high heat, and be sure to lightly oil the grate.
Grill the pineapple, red bell pepper, and jalapeño, turning often. The pineapple should get light grill marks in about 3 minutes, while the peppers will need 5 to 7 minutes to brown on all sides. Once done, carefully take the peppers off the grill and put them in a paper bag to cool.
When the peppers are cool enough to handle, gently rub off their skins with a paper towel. Halve them and discard the seeds. Dice the cooled pineapple and peppers into small pieces and put them in a bowl. Add the mango, red onion, cilantro, lime juice, and lime zest. Stir everything together, then cover the bowl with plastic wrap. For the best flavor, refrigerate the salsa for 8 hours to 1 day before serving.
Have fun experimenting by adding other fruits, such as apples, cantaloupe, honeydew melon, watermelon, lemon, or orange.
Provides 6 servings