Fresh tomatoes bring rich flavor to any meal, but keeping them from spoiling can be a challenge. A simple method of tomato preservation can lock in their taste, allowing you to enjoy garden-fresh tomatoes long after the season ends.
Anyone can do it with the right steps. No complicated tools or expert skills are needed. A few basic supplies and a little time will help you stock your pantry with preserved tomatoes. Keep reading to learn how.
Gather Your Supplies
Start with the right tools to make tomato preservation easy and safe. You will need:
- Fresh, ripe tomatoes
- Canning jars with lids and bands
- A large pot or water bath canner
- A jar lifter for safe handling
- A funnel for easy filling
- A ladle for pouring liquids
- Bottled lemon juice or citric acid for acidity
- A clean towel for drying jars
Having everything ready before starting will save time and prevent mistakes.
Prepare the Tomatoes
Wash the tomatoes well to remove dirt and bacteria. Remove the stems and any damaged spots. To make peeling easier, blanch them in boiling water for 30 seconds, then transfer them to an ice bath. Once cooled, peel off the skins and remove the cores.
For whole or halved tomatoes, leave them as they are. For crushed tomatoes, cut them into smaller pieces. Keep everything clean to ensure safe canning.
Sterilize the Jars
Clean jars prevent contamination and ensure a good seal. Wash them with hot, soapy water and rinse well. Place the jars in a large pot, cover them with water, and bring to a simmer (180°F). Keep them hot until ready to use.
Lids and bands should also be cleaned. Place the lids in a small pot of hot water (not boiling) to soften the sealing compound. Keep everything clean and hot to avoid spoilage.
Fill the Jars Properly
Add bottled lemon juice or citric acid to each jar to ensure safe acidity. Use 2 tablespoons of lemon juice or ½ teaspoon of citric acid per quart jar.
Pack the prepared tomatoes into the jars, leaving ½ inch of space at the top. If using whole or halved tomatoes, press them down to remove air pockets. If adding salt, use 1 teaspoon per quart for flavor.
Run a non-metallic utensil around the inside of the jar to remove trapped air bubbles. Wipe the rims with a clean, damp cloth to ensure a tight seal.
Seal the Jars Tight
Place the lids on the jars, making sure they sit flat. Screw the bands on until they are fingertip-tight. Do not overtighten, or air will not escape during processing.
A loose seal can cause leaks, while an overly tight one may prevent proper sealing. Check each jar to ensure the lids are centered and secure before moving to the next step.
Process in a Water Bath
Place the filled jars into a large pot or water bath canner. Add enough water to cover the jars by at least 1 inch. Bring the water to a rolling boil.
Process pint jars for 40 minutes and quart jars for 45 minutes. Adjust time if you are at a high altitude. Keep the water boiling the entire time.
Once done, turn off the heat and let the jars sit for 5 minutes before removing them carefully with a jar lifter. Do not tilt or shake the jars.
Cool and Store Safely
Place the hot jars on a clean towel or cooling rack. Keep them upright and leave at least an inch of space between them. Let them cool undisturbed for 12 to 24 hours.
Do not press the lids or move the jars while they cool. Sudden temperature changes can break the glass or affect the seal.
Check for a Good Seal
After the jars have cooled, check the lids by pressing the center. A properly sealed lid will not move or make a clicking sound. If a lid pops up and down, the jar did not seal properly.
For any unsealed jars, refrigerate them and use them within a few days. Store sealed jars in a cool, dark place. Label them with the date and use them within a year for the best flavor.
How Long Do Preserved Tomatoes Last?
Properly preserved tomatoes can last a long time when stored correctly. Quality, safety, and flavor depend on storage conditions and the sealing process.
Shelf Life of Preserved Tomatoes
Preserved tomatoes maintain the best quality for 12 to 18 months. They remain safe to eat beyond that, but color, texture, and flavor may decline.
Jars stored in a cool, dark place will last longer. Exposure to light, heat, or moisture can shorten shelf life. Always label jars with the date for easy tracking.
Signs of Spoiled Tomatoes
Check for these signs before using preserved tomatoes:
- Bulging lids – A sign of gas buildup from bacteria.
- Leaks or rust – Damaged lids or jars can lead to spoilage.
- Fizzing or bad smell – Opening a jar should not release gas or a foul odor.
- Mold or strange color – Any discoloration or growth means the tomatoes are unsafe.
Best Tomatoes for Preservation
Not all tomatoes work well for preservation. Some varieties have higher water content, leading to a thinner final product, while others have richer flesh and better flavor retention.
Best Varieties
- Roma (Plum) Tomatoes – Thick flesh, fewer seeds, and low water content.
- San Marzano – Slightly sweeter with rich flavor, ideal for sauces.
- Amish Paste – Meaty and flavorful, great for whole or crushed tomatoes.
- Celebrity – A good all-purpose option with balanced acidity.
- Big Mama – Large, easy-to-peel tomatoes with minimal seeds.
Tomatoes to Avoid
- Cherry or Grape Tomatoes – Too small and watery for proper canning.
- Beefsteak Tomatoes – Juicy but have too much water, leading to a thinner texture.
- Overripe Tomatoes – Can affect acidity and lead to spoilage.
Ways to Use Preserved Tomatoes
Preserved tomatoes are versatile and work in many dishes. Whether used for quick meals or slow-cooked recipes, they add rich flavor to homemade meals.
Quick and Easy Recipes
- Tomato Soup – Blend preserved tomatoes with broth and seasonings for a creamy, comforting soup.
- Pasta Sauce – Simmer tomatoes with garlic, onions, and herbs for an easy homemade sauce.
- Shakshuka – Cook eggs in a spiced tomato base for a hearty breakfast or brunch.
- Tomato Rice – Mix tomatoes with rice and spices for a simple side dish.
Slow-Cooked Dishes
- Chili – Adds depth and flavor to any chili recipe.
- Stews and Braises – Enhances the richness of slow-cooked meats.
- Curry Bases – Works well in Indian and Mediterranean-style curries.
Creative Uses
- Homemade Ketchup – Cook and blend tomatoes with vinegar and spices.
- Salsa – Mix with onions, peppers, and lime juice for a fresh dip.
- Pizza Sauce – A simple mix of tomatoes, garlic, and basil makes a great base.
FAQs
Can I Add Other Vegetables to My Preserved Tomatoes?
No, adding other vegetables like onions, peppers, or garlic without following a tested recipe can change the acidity level, making the tomatoes unsafe for water bath canning. Use a pressure canner if you want to preserve tomato-based mixtures with vegetables.
Do I Need to Peel Tomatoes Before Canning?
Peeling is recommended because tomato skins can become tough and affect texture. Skins may also contain bacteria that can alter acidity. If you prefer to keep the skins, use a tested pressure canning recipe.
Why Is My Preserved Tomato Liquid Separating?
Separation happens when tomatoes are packed raw or processed too slowly. Natural enzymes break down the pulp before the heat deactivates them. To prevent this, heat tomatoes quickly before packing them into jars.
Can I Reuse Canning Lids for Tomato Preservation?
No, canning lids are designed for one-time use. Reusing them may result in failed seals, which can lead to spoilage. The metal bands, however, can be reused as long as they are not rusted or bent.
What Happens If I Forget to Add Lemon Juice or Citric Acid?
If lemon juice or citric acid is not added, the acidity may not be high enough to prevent bacterial growth. If you realize the mistake after sealing the jars, store them in the refrigerator and use them within a few days.
Bottom Line
Water bath tomato preservation is a simple and effective way to preserve fresh tomatoes for long-term storage. With the right tools and careful steps, anyone can safely can tomatoes at home. Choosing the best tomato varieties, following proper sealing techniques, and storing jars correctly will ensure high-quality results.
Home-canned tomatoes add convenience and fresh flavor to countless recipes. Whether used in soups, sauces, or stews, they bring a taste of summer to meals all year round. Follow the instructions carefully, avoid common mistakes, and enjoy the benefits of homemade preserved tomatoes.
