A ridiculously simple and flavorful heirloom tomato salad that highlights the natural beauty and taste of fresh, ripe tomatoes, complemented by briny Kalamata olives and aromatic basil.
This salad is best enjoyed fresh. If you have leftovers, store them in an airtight container in the refrigerator for 1-2 days, though the texture of the tomatoes may change slightly. For picnics, prep tomatoes and onion separately and dress just before serving. Soaking chopped red onion in ice water for 10 minutes can mellow its sharpness.