Heat the 1 Tbsp. oil in a large skillet over medium-high heat. Using tongs, transfer the pineapple slices to the pan in batches and sauté until browned on both sides, 3 to 5 minutes. Remove from heat and let cool to room temperature.
Cut the pineapple into a ¼” dice. In a large bowl, combine the pineapple, bell pepper, orange juice and lime juice. Stir in the lime zest. Let sit for about 20 minutes before serving. Or, cover and refrigerate for up to 3 days.