Spray a grill pan with cooking spray and set over high heat. Add the pineapple in a single layer and sear, about 2 minutes per side. Set aside to until cool enough to handle. Cut into small dice and add to a large bowl.
Add remaining ingredients to the pineapple and toss to combine. Allow to rest for 30 minutes refrigerated. Serve.
Notes
Tips for Storing
Room temperature: Do not leave this salsa out for more than 2 hours.
Refrigerator: Store in an airtight container for up to 3 days. Stir before serving and add a fresh squeeze of lime to revive the flavors.
Freezing: Not recommended. The pineapple and onion become mushy and watery once thawed.
Reheating: This is a fresh, cold salsa — no reheating needed. Serve chilled or at room temperature straight from the fridge.