Here is the easiest way I've found so far...
First go out to your garden & pick all of the red tomatoes. *If you don't have a garden, you may buy them at a farmers market, from a neighbor, or at the store if you must. Now, make a note to yourself.
Plant a garden next year!
Next, wash the tomatoes in cool water.
Cut out the stem and any bad spots out.
Place them in a blender & blend.
Pour the beautiful pink colored juice into a big soup/stock pot.
Bring this to a boil then turn it down to a simmer.
Allow to simmer for about 1 hour. ~Until it's the desired consistancy you like. The more you cook it, the thicker it will become.
Now ladle this into your clean canning jars.
Whipe the rims, put on lids, & place in water bath canner.
When water is boiling process for 30 minutes.
Carefully remove jars and allow to set untouched until the seal "pops."
Notice you do not have to peel the tomatoes? If you've done this before you will appreciate that you don't have to fool with that!