Get the tomatoes ready.
Give each tomato a good wash. Cut them into medium pieces after removing the stems and cores. For a smoother soup, blanch the tomatoes in hot water for 30 seconds, then place them in an ice bath to remove the skins.
Sauté the veggies
In a big stockpot, warm the olive oil. Add the chopped garlic, celery, and onion. Sauté for 5 to 7 minutes, or until fragrant and soft. This establishes the soup's flavour base.
Add Tomatoes and Broth
Add Tomatoes and Broth Fill the pot with the chopped tomatoes, broth, sugar, salt, and pepper. Mix thoroughly to blend. The tomatoes should be tender and completely broken down after 25 to 35 minutes of cooking over medium heat.
Blend the soup.
Take the pot off of the hob. Puree the soup in an immersion blender until it is smooth. Run the soup through a fine mesh sieve to get rid of the seeds and skins if you want a really smooth texture.
Heat the soup again
Return the blended soup to low heat and adjust the spice. Do not add dairy at this point. Dairy should only be added after the jar has been opened during serving because it cannot be securely canned.
Get the jars ready.
Use hot, soapy water to clean all mason jars, lids, and rings. Boil the jars for ten minutes to sterilise them. Until they are ready to be filled, keep them warm.
Pour in some lemon juice
Add two tablespoons of bottled lemon juice to each pint jar or four tablespoons to each quart jar to guarantee safe acidity. Do not omit or replace this step.
Put the Jars in
With a 1-inch headspace, ladle hot soup into the heated jars. After cleaning the rims, put the lids on top and tighten the rings just enough.
Process in a Pressure Canner
Place jars in the pressure canner. Process at 10 pounds pressure for:
20 minutes (pint jars)
25 minutes (quart jars)
Follow your pressure canner’s manual for preparation and cooling steps.
Store and Cool
Let the canner naturally depressurise after processing. Take the jars out and let them cool for 12 to 24 hours. Verify the seals; the lids should not flex. For up to a year, keep sealed jars in a cold, dark location.