Raw Pack Canning Tomatoes: Your Guide to Pressure & Water Bath

Preserving the vibrant taste of summer's bounty is a rewarding endeavor, and canning tomatoes is a time-honored tradition for many home cooks. Among the various methods, raw pack canning stands out for its simplicity, allowing you to quickly get your garden-fresh tomatoes into jars with minimal fuss. This comprehensive guide will walk you through the essential steps for raw pack canning tomatoes, suitable for both pressure canning and water bath canning, ensuring a safe and delicious result you can enjoy year-round. The "raw pack" method means you fill your jars with raw, unheated tomatoes. While this speeds up the packing process, it's crucial to understand that *all* home-canned tomatoes, regardless of packing method, require proper processing in a canner. The preparation steps leading up to the actual canning are largely the same whether you opt for a pressure canner or a water bath canner; only the processing times and equipment differ. Let's dive into how to master this popular method.

Essential Preparations for Safe & Successful Canning

Before you even touch your first tomato, setting up your canning station is paramount. Safety and efficiency begin here.

Getting Your Equipment Ready

First and foremost, familiarize yourself with your chosen canner – whether it’s a pressure canner or a large water bath canner. Read its instructions thoroughly, especially if you’re new to canning. Ensure all parts are clean and in good working order.

Next, prepare your canning jars. Wash them thoroughly with hot, soapy water, rinse well, and keep them hot until ready to fill. This can be done in your canner with simmering water, in a dishwasher, or a large pot on the stovetop. Lids should be prepared according to the manufacturer's directions, typically by simmering in hot (not boiling) water. Rings simply need to be clean and free of rust.

Begin heating water in your canner while you prepare your tomatoes. This ensures your canner is ready to go as soon as your jars are packed, minimizing downtime and maintaining a consistent temperature for processing.

The Critical Step: Peeling and Coring Tomatoes

Perhaps the most debated step in canning tomatoes is peeling, but it’s non-negotiable for safety and quality. All current, tested recipes and methods for home-canned tomatoes assume peeled tomatoes. Leaving the skins on can harbor bacteria and alter the density and heat penetration during processing, rendering the tested processing times ineffective and potentially unsafe. Plus, peeled tomatoes have a far superior texture in your finished product.

The easiest way to peel tomatoes is blanching:

Bring a large pot of water to a rolling boil.
While the water heats, prepare an ice bath in a large bowl.
Carefully dip a few tomatoes at a time into the boiling water using a slotted spoon or a blanching basket. Watch for the skins to split, which usually takes about 60 seconds, sometimes a little more for very firm tomatoes.
Immediately transfer the blanched tomatoes from the boiling water to the ice bath. This stops the cooking process and makes them easy to handle.
Once cool enough, slip off the skins. They should come off with ease.
Core the tomatoes by removing the stem end and any tough, green portions. Often, this comes off cleanly with the peel.

While working, you'll notice some tomatoes are meatier than others. Varieties like Roma tomatoes are often preferred for canning due to their lower water content, making them ideal for creating thick sauces and robust canned tomatoes. Smaller tomatoes can be left whole, while larger ones should be cut into halves or quarters to fit comfortably into your jars.

Acidification and Seasoning: Flavor & Safety

One of the most critical safety steps in canning tomatoes, regardless of the canning method, is acidification. Tomatoes, while seemingly acidic, can vary greatly in pH depending on the variety, growing conditions, and ripeness. To ensure they are sufficiently acidic for safe home canning and to prevent the growth of harmful bacteria like Clostridium botulinum, you must add an acid. This is not optional; it's a mandatory step outlined in all tested canning recipes.

For quarts, add 2 tablespoons of bottled lemon juice per jar. For pints, add 1 tablespoon. Bottled lemon juice is recommended over fresh because its acidity level is standardized and reliable. If you prefer to avoid lemon juice, you can use 1/2 teaspoon of citric acid per quart or 1/4 teaspoon per pint, or 4 tablespoons of 5% acidity vinegar per quart (2 tablespoons per pint) for a slightly different flavor profile. The good news is that the added acidity generally doesn't significantly alter the taste of your cooked dishes.

Salt, on the other hand, is entirely optional and added purely for flavor. If you enjoy the traditional taste, add 1 teaspoon of canning salt per quart jar or 1/2 teaspoon per pint. For those on low-sodium diets, feel free to reduce or eliminate it. It will not affect the safety or shelf life of your canned tomatoes. It’s often easiest to add the lemon juice and salt to the empty jars before you begin filling them with tomatoes. If you forget, don't worry—you can add them on top of the tomatoes, just make sure there's enough headspace.

For a deeper dive into why these steps are so important, check out our article on Peel & Acidify: Your Guide to Safe & Delicious Canned Tomatoes.

Packing Your Jars: The Raw Pack Method

With your tomatoes peeled, cored, and your jars ready with acid and optional salt, it’s time for the "raw pack." This method is beautifully simple: you pack the raw tomatoes directly into the jars. No water is added; instead, you rely on the tomatoes to release their own natural juices.

As you peel and core, immediately place the tomatoes into your hot jars. Press down firmly on the tomatoes to fill any spaces and encourage them to release their liquid. This will lightly crush them, which is exactly what you want. Continue adding tomatoes and pressing down until the juice covers the tomatoes, leaving a 1/2-inch headspace from the rim of the jar. This headspace is crucial for proper sealing and to prevent food from bubbling out during processing.

Once packed, it’s vital to remove any trapped air bubbles. A small, non-metallic utensil, like an orange peeler, a rubber spatula, or a plastic knife, works perfectly. Gently slide the utensil along the inside edge of the jar, allowing air bubbles to escape. Adjust the tomatoes and liquid to maintain the 1/2-inch headspace if necessary.

Finally, wipe the rims of the jars meticulously with a clean, damp cloth. Any food residue on the rim can prevent a proper seal, leading to spoilage. Place the prepared lids and rings on the jars, tightening the rings finger-tight – just enough to hold the lid in place, but not so tight that air can’t escape during processing.

Learn more about the nuances of this stage in Raw Pack Tomatoes: Mastering Peeling, Acidification, & Filling Jars.

Processing Your Raw Packed Tomatoes

Now that your jars are packed and sealed, it's time for the processing step. This is where the paths of pressure canning and water bath canning diverge, though both are safe for raw packed, acidified tomatoes when done correctly according to tested recipes.

Water Bath Canning: For water bath canning, carefully place your packed jars into your water bath canner, ensuring they are covered by at least 1-2 inches of water. Bring the water to a rolling boil and process for the time specified by a tested recipe, adjusted for your altitude. Tomatoes canned in a water bath canner will typically have a softer texture due to the longer high-heat exposure needed at a lower temperature.
Pressure Canning: For pressure canning, place your jars in the pressure canner, ensuring the water level is as specified by your canner's manufacturer (usually 2-3 inches). Secure the lid, bring the canner to a boil, and vent steam for 10 minutes. Then, place the weighted gauge or close the petcock and bring the canner to the recommended pressure (usually 10 or 11 pounds for most altitudes) and process for the specified time. Pressure canning generally results in a firmer product and is often preferred for whole or diced tomatoes.

Always consult an up-to-date, tested canning recipe from a reliable source like the National Center for Home Food Preservation (NCHFP) for specific processing times based on your tomato type (whole, crushed), jar size (pint, quart), and most importantly, your altitude. Adjusting for altitude is crucial for safety.

After Processing: Cooling and Checking Seals

Once processing is complete, turn off the heat and allow the canner to cool naturally. For pressure canners, wait until the pressure completely drops to zero before opening. Carefully remove the hot jars from the canner and place them on a towel or a wire rack, ensuring there's space between them to cool undisturbed for 12-24 hours. You'll likely hear the satisfying "ping" sound as the jars seal.

After cooling, check each jar for a proper seal. The lid should be concave (curved inward) and not flex when pressed. If a lid is not sealed, refrigerate the jar and consume its contents within a few days, or reprocess immediately (within 24 hours) with a fresh lid, using the full processing time. Remove the screw bands, wipe down the jars, label them with the contents and date, and store in a cool, dark, dry place. Properly canned tomatoes can last for at least a year.

Conclusion

Raw pack canning tomatoes is an accessible and efficient method for preserving the essence of summer. By diligently following each step – from proper equipment preparation and meticulous peeling to accurate acidification and careful jar packing – you ensure both the safety and exceptional flavor of your home-canned produce. Whether you choose the gentle heat of a water bath or the intensity of a pressure canner, the reward is a pantry stocked with delicious, versatile tomatoes ready for your culinary creations. Enjoy the fruits of your labor!