How to Can Tomato Juice in Canada (Bernardin Method)
To safely can tomato juice in Canada, add 1 tablespoon of bottled lemon juice per 500 mL jar or 2 tablespoons per 1 L jar before processing. This acidifies the juice below pH 4.6, the threshold for safe water-bath canning. Simmer and sieve the tomatoes, reheat the juice to near-boiling, hot-pack into acidified jars leaving 1 cm headspace, apply two-piece lids, and process in a boiling water bath for the time and altitude band published in your Bernardin recipe.
A row of jarred tomato juice is one of the most useful things a Canadian garden gives back. It drinks straight, it’s the base for soup and chili, and it’s the simplest way to put up a bumper tomato crop when you don’t have time to peel and pack whole tomatoes.
It’s also a low-acid food waiting to happen if you skip one step. This guide covers the water-bath method, following Bernardin and Health Canada. Per our food-safety policy we cite Bernardin for processing times rather than reprinting them — keep your edition open beside this page.
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The single most important rule: acidify every jar
Every Bernardin tomato recipe — juice included — opens with the same line:
Add 1 tbsp bottled lemon juice per 500 mL jar, or 2 tbsp per 1 L jar. Alternative: ¼ tsp citric acid per 500 mL, or ½ tsp per 1 L.
This goes in every jar, every time, no matter the variety and no matter how tart the juice tastes. Modern tomato cultivars sit right around the pH 4.6 line that separates high-acid (water-bath safe) from low-acid (pressure canning required). The acid pushes the juice reliably under 4.6 — which is the only thing that makes the boiling-water method safe for tomatoes at all.
Bottled lemon juice only. Fresh lemon juice varies in acidity from lemon to lemon and is not safe here. See the pH 4.6 rule in full for why this matters so much.
What you need
- 10–11 kg (22–24 lb) ripe tomatoes — juice is the recipe for a glut, so any variety works
- Boiling water bath canner (a tall stockpot with a rack works)
- 6–7 × 1 L Bernardin jars, or double the count in 500 mL, plus new SNAP lids and bands
- Bottled lemon juice OR food-grade citric acid
- A food mill or fine sieve to separate skins and seeds
- A jar lifter and a headspace tool
Sieves the skins and seeds out of tomato juice in one pass, no peeling. Three discs also handle applesauce and berry jam. The default Canadian pick for putting up a tomato glut.
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The method (about an hour of active work)
- Warm the jars and canner. Fill the canner, bring to a simmer, and heat the jars in the hot water so they don’t crack when filled.
- Core and quarter the tomatoes, dropping them into a big pot as you cut.
- Heat fast. Bring the pot to a boil while you add tomatoes, crushing them as they soften, and simmer ~5 minutes. Fast heat is the trick to less juice separation in the jar.
- Sieve. Run the hot tomatoes through a food mill or fine sieve. Return the juice to the pot and reheat to just below boiling.
- Acidify each jar. Lemon juice or citric acid into every empty hot jar, in the amount above. Add optional salt for flavour.
- Fill. Ladle hot juice in, leaving 1 cm (½ inch) headspace. Wipe rims, apply fresh SNAP lids fingertip-tight.
- Process in the boiling water bath for the time in your Bernardin edition for tomato juice, at your altitude band. Time starts at a full rolling boil.
- Cool and check. Rest 5 minutes in the canner, lift to a towel, and leave 12–24 hours before checking seals.
Common questions
It separated into a clear layer and a pulpy layer. That’s cosmetic — safe to drink, just shake. Heating the cut tomatoes faster next time reduces it.
A jar didn’t seal. Refrigerate and use it within a few days, or reprocess within 24 hours with a fresh lid. See jar didn’t seal — is it safe.
How long does it keep? Sealed and stored cool and dark, about a year for best quality. See how long home-canned food lasts.
Related tomato guides
Frequently asked questions
Do I need to add lemon juice to canned tomato juice?
Yes — bottled lemon juice (or citric acid), every jar, every time. Modern tomato varieties sit close to pH 4.6, the line between high-acid (water-bath safe) and low-acid (pressure canning required). Adding 1 tablespoon of bottled lemon juice per 500 mL jar or 2 tablespoons per 1 L jar pushes the juice reliably below 4.6. This is the Bernardin and Health Canada rule for every tomato recipe, juice included.
Why does my canned tomato juice separate into layers?
Layer separation (clear liquid on top, pulp below) is a quality issue, not a safety one — the juice is safe to drink and just needs a shake. To reduce it, work fast: quarter the tomatoes straight into a hot pot and heat them immediately as you cut, rather than letting cut tomatoes sit. Fast heating deactivates the enzyme that breaks pectin down and causes separation.
Can I add salt or other vegetables to tomato juice?
Salt is optional and for flavour only (about ½ tsp per 1 L) — it does not affect safety, so leave it out if you prefer. Do NOT add low-acid vegetables like celery, onions, peppers, or carrots to a plain-juice recipe: they raise the pH and make water-bath canning unsafe. For a vegetable-juice blend, use a Bernardin-tested recipe with its own acidification and processing time, or pressure can it.
What's the difference between canning tomato juice and tomato sauce?
Tomato juice is sieved thin and pourable; sauce is cooked down thicker. Both follow the same acidification rule (lemon juice or citric acid in every jar), but they have different Bernardin processing times because thickness changes how heat penetrates the jar. Use the juice time table for juice and the sauce time table for sauce — don't swap them.
Sources
- Bernardin Complete Book of Home Preserving (latest edition)
- Health Canada — Food safety for home canning