Note 1: If using a tomato variety with a high water content (such as heirloom or beefsteak), you may want to transfer the diced tomatoes to a large bowl and season with ¼ teaspoon of salt. Let them stand for 20 minutes to draw out the water, then strain off the excess liquid. This is optional, and only needs to be done if you prefer a salad with less excess water. If using Roma tomatoes, which have a naturally lower water content, this step can be skipped.