I prefer a salsa with a smooth texture, so the first task is to
reduce the tomatoes to nearly a sauce-like consistency. Bring a large
pot of water to a boil. Place a bowl of ice water near the water pot.
Cut the stems out of the tomatoes. Make a slice in the skin of each.
Place the tomatoes, a few at a time, in the boiling water. The tomato
skin should start to peel away from the flesh around the slices.
When the skin seems loose, transfer the tomatoes to the ice water.
The skin should peel further. Use your hands to remove the skin from
the tomatoes - it should slide right off.
Cut the tomatoes into quarters. Chop the quarters in a food
processor, about 10-20 seconds.
Add the chopped tomatoes to a pot over high heat with about a cup
of cold water. When the mixture boils, reduce heat and simmer until
the tomatoes have a consistency of the salsa you prefer. Transfer
the tomatoes to a mixing bowl.