There are a couple reasons why a recipe may call for seeded tomatoes — to prevent a liquidy dish or create a smoother texture. Here’s how to seed tomatoes easily and efficiently: First, cut the tomato correctly. It should be cut crosswise across its equator, not from top to bottom. This exposes all of the seeds. If you’re cooking the tomato in a sauce, you can just squeeze out the seeds. But for attractive diced pieces that will be used fresh, scoop the seeds out with your finger.