Storage: Keep in an airtight container in the refrigerator for up to 3–4 days. Drain any accumulated liquid before serving and refresh with a squeeze of fresh lime juice. Do not freeze. Tomato tip: Roma tomatoes give the best chunky, non-watery texture. In summer, ripe heirloom or vine-ripened tomatoes are exceptional. Heat level: For mild pico, remove all jalapeño seeds and membranes. For medium, leave seeds in one jalapeño. For hot, use two jalapeños with seeds. Make ahead: Best made 30–60 minutes before serving. If making the day before, add lime juice within an hour of serving for the brightest flavor.