For an extra burst of flavor, consider grilling the cherry tomatoes before halving them. This will add a touch of smokiness to the salad. Feel free to experiment with other herbs such as dill or oregano. Adjust quantities to suit your personal preference. If you don't have shallots on hand, red onion can be used as a substitute. Be sure to mince it finely and soak it in cold water for a few minutes to mellow the flavor. This salad can be prepared ahead of time, making it a great option for potlucks or picnics. Store in an airtight container in the refrigerator for up to 3 days.