Layer the tomato slices across your serving platter in gentle overlapping rows. Use your largest platter here — crowding the tomatoes will make them release too much juice and turn everything watery.
Distribute the onion slices evenly over the tomatoes, breaking up any rings that are still stuck together. The onions will mellow as they sit, so don't worry if they seem a bit sharp right now.
Combine the vinegar, oil, salt, and pepper in a small bowl, whisking until the salt dissolves completely. Taste and adjust — you want a good balance of tang and richness.
Drizzle the dressing evenly across the entire salad, making sure to hit all the tomatoes. Don't dump it in one spot or you'll get pockets of overdressed and underdressed sections.
Scatter both herbs over the top, concentrating them slightly on the centers of the tomato slices where they'll stick better. The green color makes this salad look as fresh as it tastes.
Give the salad exactly 15 minutes to rest at room temperature before serving. This waiting period lets the tomatoes release their juices into the dressing, creating the perfect balance of flavors.
⏱ 15 min