How to Make Strawberry Jam in Canada (Bernardin Method)

Strawberry jam is the gateway recipe for new Canadian canners: one pot, short processing, and failure modes that are about texture rather than safety. The Complete Book of Home Preserving (ISBN 978-0-7788-0137-5) publishes three strawberry jams, on different pages and by different mechanisms. This page carries two of them in full, and points at the commercial-pectin route most people actually reach for.

As an Amazon Associate we earn from qualifying purchases. Some links on this site are affiliate links — they cost you nothing extra and help keep the site free. We do not test products; we report what Bernardin and Canadian health authorities publish. Affiliate disclosure.

The figures on this page come from the edition we hold — ISBN 978-0-7788-0137-5, 448 pages. Different editions of the Complete Book carry different figures, so verify the process time against your own edition before you start.

Three routes, and how to choose

	Route A — page 21	Route B — page 24	Route C — your pectin box
What sets it	the berries’ own pectin	2 cups (500 mL) apple purée	commercial pectin
Strawberries	8 cups (2 L) crushed	8 cups (2 L) halved hulled	per the box
Sugar	6 cups (1.5 L)	5½ cups (1.375 L)	per the box
Added acid	none	1 lemon or lime, plus 3 tbsp (45 mL) bottled juice	per the box
Extra shopping	none	5 tart apples, and a sieve	a box of pectin
Boil	to the gel test	about 20 minutes, to a mound	per the box
Source	the book	the book	the box in your hand

Route A is the simplest and Route B makes more jam. That is the book’s own framing for the page-24 section: adding apples “extends the volume you produce” and gives a not-too-sweet spread “perfect for calorie-counters and those who don’t have a home-grown berry patch or orchard.” Route A costs nothing but berries and sugar. Route B costs a 20-minute pre-cook and a sieve.

Do not blend the two. They take different sugar for the same fruit and reach a different endpoint, so a figure moved from one into the other is a recipe nobody tested.

Route A — Traditional Strawberry Jam (page 21)

The long-cook route, in the book’s Traditional Long-Cook Jams section. It follows the Traditional Apricot Jam method on page 20, which is the section’s master.

What you need

• 8 cups (2 L) crushed strawberries
• 6 cups (1.5 L) granulated sugar — and nothing else. The page-21 variations list fruit and sugar only; the apricot master’s bottled lemon juice does not carry across to strawberry.
• 8 × 250 mL Bernardin jars, new SNAP lids, and bands
• Standard canning kit — jar lifter, headspace tool, funnel, water-bath canner, ladle (which canner to buy)

Pick your strawberries with the gel in mind. The book’s page-21 tip is about three parts fully ripe fruit to one part slightly under-ripe, because under-ripe fruit carries more pectin — which is the whole barrier to a jam that sets without a box.

Method

1. Prep the canner and jars. Fill the canner with enough water to cover the jars by 2.5 cm and bring to a simmer. Warm the empty jars in it.
2. Crush the berries one layer at a time with a potato masher to yield 8 cups (2 L). Do not purée — small chunks are correct.
3. Combine the crushed strawberries and the 6 cups (1.5 L) of sugar in a large, deep stainless steel saucepan.
4. Boil, stirring frequently, until it thickens, then take it off the heat and test for a gel. No boil time is published for this recipe — the endpoint is the test, not the clock, and the book’s gel tests are on its page 19. If it has not reached the gel stage, cook 5 minutes more and test again. The cold-plate test is the one most Canadian kitchens use.
5. Skim and jar. Ladle into hot jars leaving 0.5 cm (¼ inch) headspace. Wipe the rims, centre fresh SNAP lids, screw bands to fingertip-tight.
6. Process 10 minutes with the jars completely covered, adjusted for your altitude band. Remove the canner lid, wait 5 minutes, then lift the jars out.
7. Cool 24 hours undisturbed, then confirm each lid sealed.

Route B — Strawberry Summer Fruit Jam (page 24)

The apple-pectin route, and the master recipe of its own section. The apples are the pectin; the strawberries are the flavour.

What you need

• 5 tart apples, such as Granny Smith, stem and blossom ends removed, chopped coarsely, cores intact — that is the book’s instruction, and much of the pectin is in the cores
• 1 lemon or lime, finely chopped
• 3 tbsp (45 mL) bottled lemon or lime juice
• Water — enough to prevent sticking; the book publishes no quantity
• 8 cups (2 L) halved hulled strawberries
• 5½ cups (1.375 L) granulated sugar
• 8 × 250 mL Bernardin jars, new SNAP lids, and bands

Wash the berries gently, in small batches in a colander under cool running water — the book’s own tip, to get the grit off without bruising soft fruit.

Method

1. Make the applesauce. Combine the apples, the chopped citrus and its juice, and enough water to prevent sticking, in a large deep stainless steel saucepan. Bring to a boil over high heat, then reduce, partially cover and boil gently 20 minutes, stirring occasionally, until very soft. Working in batches, press through a fine sieve with the back of a spoon to yield 2 cups (500 mL) of applesauce. Discard the skins and cores.
2. Prepare the canner, jars and lids.
3. Combine the applesauce, the strawberries and the sugar in a clean large, deep saucepan. Bring to a boil over medium heat, stirring constantly to dissolve the sugar. Boil, stirring frequently, about 20 minutes, until it thickens and mounds on a spoon. Take off the heat and skim the foam.
4. Jar at 0.5 cm (¼ inch) headspace, exactly as in Route A.
5. Process 10 minutes covered, remove the canner lid, wait 5 minutes, lift out, cool 24 hours.

The endpoint here is a mound, not a gel test, and that is the sharpest difference between the two routes: page 24 gives about 20 minutes and a spoon test, and cites no gel test at all. Use each route’s own endpoint.

Route C — the commercial-pectin route

This is what most Canadian kitchens do, and the book does publish a recipe for it. Page 10 is a commercial-pectin plain strawberry jam, read on 19 September 2026 and now recorded in our Bernardin registry. We have not written that route up on this page yet, and we are not going to summarise a tested recipe from memory of one photograph, so the figures below are still not ours to give.

So for this route, the recipe inside your pectin box is the tested source — quantities, boil time and processing time all come from it.

• Bernardin Original (powdered) and Certo (liquid) are not used the same way. For powdered pectin the order is: whisk the pectin into the crushed fruit until dissolved, bring to a boil, and only then add the sugar all at once and return to a full rolling boil. For liquid pectin the order is the other way about. Getting the order wrong is the commonest reason a pectin batch fails to set, and it is the one thing the box is unambiguous about.
• The book’s own warning is worth honouring: because each pectin is designed to work under specific conditions, the brands are not interchangeable. Follow the recipe for the pectin you actually bought.
• If you want a book-sourced pairing instead, strawberry-rhubarb jam is page 30’s tested pectin recipe.

Corrected 19 September 2026: the notice below, published a day earlier, and this page’s commercial-pectin section both said the Complete Book publishes no commercial-pectin plain strawberry jam “on the five pages we have read (21, 24, 28, 29 and 30)”. Page 10 is exactly that recipe. It sits eleven pages before the lowest page in that list, so the book publishes three strawberry jams rather than two, and the route this page called unsourced has a tested source after all. The hedge was honestly scoped and it was still wrong, because the pages we chose to read started too late in the book. Page 10’s figures are now in this site’s Bernardin registry; the route itself is not written up here yet, so for a commercial-pectin batch the recipe inside your pectin box is still the one to follow. One thing the earlier notice got right and we are not reversing: the 8-cups-crushed-to-7-cups-sugar ratio it retired is still not Bernardin’s. Page 10 pairs 7 cups of sugar with 5 cups of crushed berries, and page 21 pairs 8 cups of crushed berries with 6 of sugar — no recipe in the book pairs the two numbers we used to publish.

Corrected 18 September 2026: this page previously published its own quantities — about 8 cups of crushed berries to about 7 cups of sugar, for seven 250 mL jars — under the heading “The Bernardin/Certo standard ratio”, and said that recipe was printed on every box of Certo liquid pectin sold in Canada. The ratio was ours, not Bernardin’s, and nobody here has read a Certo box. The Complete Book (ISBN 978-0-7788-0137-5) publishes two strawberry jams, at pages 21 and 24, and both are now on this page with their own quantities and their own endpoints; each fills about eight jars, not seven. The commercial-pectin route above now states no quantities of its own, because on the five pages we have read the book publishes none for plain strawberry. A sources: line naming a “Bernardin Home Canning — Strawberry jam reference” has been removed: no such page was ever opened. The prep and cook times this page carried were invented and are gone.

Altitude adjustment

Both book routes give 10 minutes for 250 mL jars. Above roughly 305 m you add minutes on top of that, and Bernardin’s bands are in the table at the foot of this page — Halifax, Toronto, Montréal and Vancouver add nothing; Saskatoon, Regina, Kelowna, Edmonton and Whitehorse add 5 minutes; Calgary, Lethbridge and the mountain towns add 10.

Storage and shelf life

• Cool, dark, dry place. A pantry or basement shelf at room temperature.
• Best quality 12 months — Bernardin’s guidance is to use home-canned food within one year. That is a quality window, not an expiry: the jar is as safe as the process made it. Colour, flavour and texture fade.
• Date every jar. Sharpie on the lid or a small label on the side.
• After opening: refrigerate and use within one week (HealthLink BC) for best quality.

Corrected 31 Aug 2026: this page previously gave an after-opening window of 3–4 weeks. HealthLink BC File #22 publishes one week for any opened home-canned container — “Once the container has been opened, refrigerate leftovers, and use within one week.” Our longer figure was never attributed to anyone. The shelf life of the sealed jar is unchanged.

What can go wrong, and how to fix it

• Jam didn’t set after 48 hours. Pectin, acid, or cooking — see the full troubleshooting guide. Salvage paths: re-cook with added pectin, call it syrup, or freeze as ice-cream topping.
• Foam on top. Skim it after taking the pot off the heat. Cosmetic.
• Fruit floating. Crushing rather than puréeing, and a good stir before ladling, is the usual answer.
• A jar didn’t seal. The 24-hour rule applies. Refrigerate and use within a few days (Bernardin’s figure), or reprocess immediately with a fresh SNAP lid, following the original processing.

Variations

• Low-sugar strawberry jam. Use Bernardin No-Sugar-Needed pectin. Follow that box’s recipe — it’s different from regular pectin, not just “less sugar.”
• Strawberry-rhubarb. The Complete Book publishes Strawberry Rhubarb Jam at page 30 and it is equal volumes — 2 cups (500 mL) of crushed strawberries to 2 cups (500 mL) of chopped rhubarb. This page used to say 1 part rhubarb to 2 parts strawberries and that the pairing lets you use slightly less commercial pectin; both were ours. Follow the tested recipe rather than substituting fruit into a strawberry-only one: see strawberry-rhubarb jam.
• Freezer jam. Skip the canning. Mix crushed strawberries, sugar, and freezer-jam pectin (instructions on a different box than regular Certo). Ladle into freezer containers, leaving 1.5 cm headspace. Freeze. Keeps 12 months frozen, 3 weeks refrigerated after thaw. Texture is softer than canned jam — many prefer it.

Use the strawberries that aren’t quite right too

Berries too soft to hull neatly still make excellent jam — crushing is the first step either way. Anything you cannot process the same day is better frozen whole than left on the counter; both book routes work from frozen fruit once it has thawed and been measured.

Next steps

• How to make strawberry-rhubarb jam — page 30’s tested pectin recipe
• Why didn’t my jam set? — the cold-plate test and salvage paths
• The Canadian pectin guide — which of the five pectins sold here does what
• Canadian altitude adjustments — for your processing time
• Water-bath canning pillar — the full method