1. Bring a large pot of water to a boil, and blanch tomatoes, in batches, for 30 seconds. When cool enough to handle, peel, core, and halve. Work over a strainer set over a bowl to catch the juices, and remove the seeds.

2. Add 1 teaspoon salt and 2 basil leaves to each jar. Place tomatoes, cut sides down, in jars. Use a knife or spatula to remove air bubbles or extra space. Press down on the tomatoes to compact, and fill jars with the reserved tomato juice to within 1/2 inch of the rim. Wipe the rim, put on a hot lid and screw top, and transfer jars to the hot water. Repeat until all jars are filled and water covers them by 1 to 2 inches. Bring water to a boil, cover, and process for 45 minutes. Remove jars from pot, and let cool 24 hours. Test seals.