Today I'm canning tomato paste. These are all San Marzano tomatoes that I grew in my garden, and as I got overwhelmed with processing them in the summer, I just cleaned them and tossed them into Ziplocs in the freezer. I pulled out a couple of bags last night and filled the pot and put in the refrigerator to thaw overnight. Spoiler: they didn't really thaw, but they were thawed enough to be able to chop them.
I'm using the official recipe from here, with some modifications. Yield they say is about 4-4.5 half pints (though I'm putting into quarter pints and reusing other small jars).
Tomato paste recipe
Ingredients
- 7 pounds tomatoes - paste variety
- 1/2 tsp citric acid or ** lemon juice
- 2 bay leaves
- 1/2 tsp salt
- 1 clove garlic
Instructions
- Prepare jars (4-5 half pints worth) and lids; keep warm.
- Clean tomatoes if not already done. (Recipe calls for coring which I did not do.)
- Chop tomatoes. I chopped them in half or quarters depending on size (they were small); recipe calls for 1/2-3/4 inch size.
- Bring to a boil, then slowly simmer until volume reduced by half (an hour or more). Keep stirring regularly to keep from burning or sticking.
- Remove from heat and run through a food mill or a sieve. (Recipe specifically says not to use food processor or blender but I"m not sure everyone follows that)
- Return to pot, add remaining ingredients.
- Cook slowly until reduced by half again (two or more hours). Stir frequently and be careful of hot spatter.
- Remove bay leaf and garlic.
- Put into prepared jars, remove air bubbles, 1/2" headspace, clean rims, lid.
- Process for 45 minutes in half pint jars.