Here are the choices for freezing your tomatoes with the skins intact:
- just stick them in a container and freeze (yes, you can do this!)
- quarter them, put them in a container, and freeze
- blend them, put them in a container, and freeze
- quarter or eighth them, then cook & cool them, put them in a container, and freeze
- blend, cook, cool, put in a container, and freeze (my choice)
Here is what you need for my method:
- a blender or food processor (a stick blender would work, but I think a regular blender is better at grinding the skins)
- a knife
- a large pot (unless you want to freeze them uncooked)
- freezer containers or bags
Wash, core, and quarter or halve the tomatoes. If you have a powerful blender, then you can probably skip the quartering or halving. Note: I wash all of my tomatoes and put the first couple in the blender while I core the rest of them. I have to start with a couple of quarters, but as the blender gets full I can halve them and sometimes even leave them whole.
Blend the tomatoes thoroughly; this is especially important if you are retaining the skins. I add my blended tomatoes to the pot as I go and keep blending in batches until they're done. If you are not going to cook your tomatoes, then you can pour them directly into freezer containers at this point. Don't forget to leave headspace in your containers!
Add the blended tomatoes to your pot, heat them up on medium for about 10-15 minutes and then turn them to low or medium-low until they are cooked down to a tomato sauce consistency. This takes a while depending on the temperature you choose. You really don't have to cook them at all, but I like to cook mine down because I don't have a ton of freezer space.
This is what it looked like after I cooked it down:
I cooked it a little longer than usual and ended up with something between tomato sauce and tomato paste. That works well for me, though, because I have tons of chicken broth and produce in my freezer right now and this will take up a bit less space. This batch of tomatoes gave me 2 3/4 quarts of thick sauce.
It took me under 20 minutes to prep the tomatoes from picking them to clean-up. I cooked them on low for a couple of hours, let the pan cool while we ate dinner and cleaned up the kitchen, then put the whole pot in the refrigerator to cool the rest of the way. I transferred the tomato sauce to freezer containers the next morning, making sure I left enough headspace.
Interested in saving some of your tomato seeds before preserving? Go here for directions.
Now I want to work on a lacto-fermented tomato-vegetable drink. Has anyone done this before?