Dice the pineapple, red bell pepper, red onion, and jalapeño into uniform small pieces.

In a medium mixing bowl, combine the 2 cups diced pineapple, 1/2 cup diced red bell pepper, 1/4 cup diced red onion, and 1 minced jalapeño.

Add the 1/4 cup chopped fresh cilantro, 1/2 tsp red chili flakes, 2 tbsp fresh lime juice, and 1/2 tsp kosher salt to the bowl.

Toss the ingredients gently until well incorporated.

Let the salsa sit at room temperature for 15 minutes before serving to allow the flavors to meld.