How to Make Strawberry Jam | French Small-Batch Recipe
How to Make Strawberry Jam
A French Small-Batch Method
There is something quietly satisfying about making strawberry jam at home.
It is one of the simplest ways to preserve a season — to hold early summer in a jar. The scent alone, as the berries warm and release their sweetness, is enough to remind you why it’s worth doing.
This is the French small-batch way.
Ripe strawberries.
Sugar.
A little lemon.
Gentle heat.
No added pectin.
No shortcuts.
No rushing the boil.
Just fruit, time and attention.
Choosing the Strawberries
The best jam begins before the pan is even warm.
Look for strawberries that are deeply coloured and fragrant — the kind that scent the room before you’ve hulled them. They should feel ripe but not collapsing.
Slightly under-ripe berries are helpful. They contain a little more natural pectin, which supports a soft set. Overripe fruit can dull the flavour and produce a looser jam.
If you can buy them locally, in season, do. We are lucky enough to have a fantastic market in Salisbury. If you are too, then it's the place to buy lots of beautiful fruit for very good value.
Ingredients (Small Batch)
1kg ripe strawberries
750g Demerara sugar
Juice of 1 lemon
This ratio creates a soft, spoonable set in the French style. If you prefer something firmer, you can increase the sugar slightly — but the beauty of strawberry jam lies in its looseness. I love using Demerara because it gives a richer depth of flavour to the jam.
Step 1: Macerate
Hull the strawberries. Halve the larger ones.
Place them in a wide bowl and scatter over the sugar. Add the lemon juice and stir gently, just enough to coat the fruit.
Cover and leave for at least four hours — overnight is better.
This resting time matters.
The sugar draws out the juices naturally. The fruit softens. The syrup begins forming before you even turn on the heat. Flavour deepens. Sugar dissolves.
Clarity begins here. Once you have tried this method, you'll never want to put the fruit straight on the heat again.
Step 2: Cook Gently
Tip everything — fruit and syrup — into a wide, heavy-bottomed pan. A copper preserving pan is perfect for this and you'll never have to deal with mess again. For the pans I recommend, see my Slow Jam Toolkit
Warm slowly at first, stirring gently until the sugar has fully dissolved. Only then bring it to a lively boil.
You’ll notice the transformation.
The colour deepens.
The scent changes.
The bubbles grow heavier.
Skim any foam that rises. It keeps the jam clear and jewel-like.
Cook for 10–20 minutes, watching more than stirring. The jam will thicken and begin to fall from the spoon in a softer sheet.
Step 3: Knowing When It’s Ready
Strawberry jam in the French style is not stiff.
It should hold — but gently.
There are two ways to test:
The Wrinkle Test
Place a spoonful on a chilled plate. Wait 30 seconds. Push it lightly.
If it wrinkles softly and holds, it’s ready.
The Temperature Guide
Setting point sits around 104–105°C.
But temperature supports observation — it does not replace it.
The jam should move slowly when tilted. It should not sit rigid like jelly.
Err on the side of soft. It will continue to settle as it cools.
Step 4: Jar While Hot
Pour the hot jam into sterilised jars, leaving a little space at the top. Seal immediately.
Let them cool completely before storing in a cool, dark place.
Unopened, they’ll keep for up to a year.
Once opened, refrigerate and use within a few weeks.
Though in truth, strawberry jam rarely hangs around for long. Not in our house, for sure!
Why This Works (Without Added Pectin)
Strawberries are lower in pectin than apples or citrus. This method relies instead on:
• Slightly under-ripe fruit
• Lemon for acidity
• Proper sugar ratio
• Controlled boiling
• Attention
The result is softer. More alive. Closer to traditional French confiture than anything shelf-stable and industrial.
It should feel fresh, even weeks later.
How to Serve It
Spoon over thick yoghurt.
Spread onto warm sourdough.
Fold through softly whipped cream.
Swirl into cake batter.
Serve with scones and clotted cream.
Or eat it directly from the jar — which although a little bit greedy, is often the truest test of a good jam!
A Final Thought
Making strawberry jam is not about precision.
It is about noticing.
Watching the bubbles change.
Smelling the fruit deepen.
Trusting the moment just before it feels “done.”
Jam rewards patience.
And when you get it exactly right — soft, glossy, gently holding — you’ll recognise the feeling.
And there you have it, summer, preserved in a jar.