In a medium bowl, combine the tomatoes, onion, cilantro, jalapeño, lime juice, garlic, and salt. Taste and adjust seasoning with lime juice and salt, adding some of the reserved seeds for a spicier salsa, if desired. Serve immediately or cover and refrigerate for up to 1 hour before serving. Store leftover salsa in an airtight container in the refrigerator for up to one day.: The moment you mix these ingredients you should notice the bright citrus scent of the lime juice lifting the aroma of the chopped tomatoes and the herbal perfume of the cilantro . The sound is subtle, just the soft clink of spoon on bowl as you fold components together, and visually you want distinct pieces of tomato and flecks of green, not a mashed purée. This technique matters because gentle folding keeps the chunks intact, giving pleasing texture to each bite. Avoid aggressively smashing the tomatoes when stirring, as that will release too much juice and make the mixture watery.
Taste and adjust seasoning with lime juice and salt, adding some of the reserved seeds for a spicier salsa, if desired: As you taste, focus on balance more than absolute amounts, noticing whether acidity, salt, or heat needs nudging. If it tastes flat, a squeeze more lime juice will brighten it; if dull, a pinch more salt will sharpen the flavors. When adding the reserved jalapeño seeds for heat, add a small amount at a time and wait a moment to let the spice bloom, because heat can intensify as it sits. A common mistake is adding too many seeds at once, which can overwhelm the other components.
Serve immediately or cover and refrigerate for up to 1 hour before serving: Serving right away preserves the crisp bite of the raw onion and the fresh aroma of the cilantro , while resting briefly in the refrigerator allows flavors to meld and the salt to draw juices from the tomatoes . You should notice a gentle melding of flavors after chilling, with less sharpness from the onion and a more cohesive mouthfeel. Avoid leaving it in the fridge too long, because extended chilling will soften textures and mute vibrancy.
Store leftover salsa in an airtight container in the refrigerator for up to one day: When storing, the salsa will continue to release juices, so the texture will become softer over time and the aroma will mellow. The ideal storage container is airtight to prevent odors from the fridge affecting the salsa, and you should consume within one day to enjoy the freshest flavor. A common error is keeping it too long, which results in a watery, less aromatic salsa, so plan portions accordingly.
