Marinate the aromatics: In a medium bowl, combine lime juice, lime zest, red onion, jalapeño, garlic, and salt. Let stand 5–10 minutes to mellow the bite.
Fold in produce: Add peaches, bell pepper, and cilantro. If using, stir in olive oil.
Rest & season: Let sit 10 minutes for flavors to meld. Taste and adjust with a pinch more salt or a squeeze of lime.
Serve: Enjoy immediately with chips or spoon over tacos, grilled fish, or chicken.
Notes
Onion gentleness: For extra-mild onion, soak the diced onion in cold water 10 minutes, drain well, then proceed with Step 1.Peach ripeness fix: If peaches are a bit tart/underripe, stir in ½–1 teaspoon sugar or honey—just enough to round the acidity.Heat control: Use ½ jalapeño for mild, a whole small one for medium; add seeds for more heat.Storage: Best day-of. Refrigerate airtight up to 24–36 hours; refresh with a squeeze of lime and pinch of salt before serving. (Not freezer-friendly.)Herby twist: Replace half the cilantro with mint or basil for a different vibe.