Water bath canning is a safe and reliable method for preserving homemade tomato soup, allowing you to enjoy the taste of summer all year round. This comprehensive guide will walk you through the process, addressing common questions and concerns to ensure your canning success.
What is Water Bath Canning?
Water bath canning is a method of preserving food by submerging sealed jars in boiling water for a specific amount of time. The heat kills harmful bacteria and creates a vacuum seal, preventing spoilage. It's particularly suitable for high-acid foods like tomato soup, which require less processing time than low-acid foods.
Why Water Bath Can Tomato Soup?
Preserving your homemade tomato soup through water bath canning offers several advantages:
- Extended shelf life: Properly canned tomato soup can last for 12-18 months or even longer.
- Cost savings: Making your own soup is often cheaper than buying commercially produced varieties.
- Control over ingredients: You can choose high-quality, fresh tomatoes and control the amount of salt, sugar, and other seasonings.
- Flavor preservation: Home-canned soup often tastes fresher and more vibrant than store-bought versions.
How to Water Bath Can Tomato Soup: A Step-by-Step Guide
Ingredients:
- 8 cups ripe tomatoes, peeled and chopped (about 6 pounds)
- 1 medium onion, chopped
- 2 cloves garlic, minced
- 1 teaspoon dried basil
- 1/2 teaspoon dried oregano
- Salt and pepper to taste
- 1 tablespoon olive oil (optional)
Equipment:
- Large pot for making soup
- Immersion blender or regular blender
- 7 pint-sized canning jars and lids
- Jar lifter
- Large canning pot and rack
- Bubble remover tool
- Canning tongs
Instructions:
- Prepare the tomatoes: Wash and peel the tomatoes. You can blanch them for easier peeling. Chop them into smaller pieces.
- Make the soup: Heat the olive oil (if using) in a large pot over medium heat. Add the onion and sauté until softened. Stir in the garlic, basil, and oregano and cook for another minute. Add the chopped tomatoes, salt, and pepper. Bring to a simmer, then reduce heat and cook for 15-20 minutes, stirring occasionally, until the tomatoes are softened.
- Blend the soup: Carefully transfer the soup to a blender (or use an immersion blender directly in the pot) and blend until smooth.
- Fill the jars: Ladle the hot soup into the sterilized canning jars, leaving 1/2 inch headspace. Remove air bubbles using a bubble remover tool. Wipe the jar rims clean.
- Seal the jars: Place the lids and rings on the jars and tighten fingertip tight.
- Process the jars: Place the jars in a canner with a rack, ensuring they are covered by at least 1 inch of water. Bring the water to a rolling boil, and process for 35 minutes (for pint jars) at 0-1000 feet elevation. Adjust processing time based on your altitude (consult a reputable canning resource like the National Center for Home Food Preservation for altitude adjustments).
- Cool and check seals: Remove the jars from the canner using a jar lifter and let them cool completely on a towel-lined surface, undisturbed. You should hear a "pop" sound as the jars seal. Check the seals by pressing down on the center of each lid; if it doesn't flex, it's sealed.
How Long Does Canned Tomato Soup Last?
Properly canned tomato soup can last for 12-18 months, or even longer, if stored in a cool, dark, and dry place.
Can I Freeze Tomato Soup Instead of Canning It?
Yes, you can freeze tomato soup. Freezing is a simpler method, but it doesn't offer the same long-term shelf life as canning. Frozen soup should be consumed within 3-6 months for best quality.
What are the Signs of Spoilage in Canned Tomato Soup?
Spoiled canned tomato soup may show signs like bulging lids, leaking jars, mold growth, or an off odor or taste. Discard any jars exhibiting these signs.
Safety Precautions for Water Bath Canning Tomato Soup
Always follow a tested recipe and carefully follow the instructions. Using a reliable canning resource, like the National Center for Home Food Preservation, is crucial for ensuring safe canning practices. Improper canning techniques can lead to foodborne illnesses. Pay close attention to processing times, based on your altitude.
Tips for Success
- Use high-quality, ripe tomatoes for the best flavor.
- Sterilize your jars and lids properly before using them.
- Leave the correct headspace in the jars to prevent spoilage.
- Ensure the water in the canner covers the jars completely during processing.
By following these instructions and safety precautions, you can enjoy delicious, homemade tomato soup all year round. Remember to always prioritize safety when canning. Happy canning!
