Plop the tomatoes into a large pot or Dutch oven and add the water. Dampen a large piece of crumpled parchment paper with cold water, open it, and place it directly on the tomatoes. Cover the pot and cook over very low heat for 30 minutes, shaking the pot occasionally to keep the tomatoes from sticking to the bottom.☞ TESTER TIP: Don't remove the lid during cooking. The tomatoes are cooking in the steam and you don't want any of that precious heat or liquid to escape.