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Strawberry Jam with Whole Berries for Winter
Instructions
I take good-quality strawberries with firm, dense berries only – they will withstand triple boiling without falling apart. Soft, over-ripe berries turn to "mush" – they are only good for a smooth jam, not for jam with whole berries. I wash the strawberries in plenty of cold water, lowering the berries in a colander – that way they are not crushed. I let them drain and dry for 10–15 minutes on a paper towel.
I carefully remove the calyx from each berry (the stalk should be pulled off only after washing – otherwise the berry fills with water). I layer the strawberries with sugar in a large bowl or enamelled pot: a layer of berries, a layer of sugar, then berries and sugar again. I cover with a lid or film and put it in the refrigerator overnight (or for the whole day – 8–12 hours).
In the morning the strawberries have released a lot of juice and "float" in the syrup that has formed – that is the result you want. I gently stir from the bottom up with a silicone spatula, without crushing the berries. I put the pot over low heat (4 out of 9 on an electric stove) and slowly bring it to a boil. You must not use high heat – it will destroy the berries.
I cook the strawberry jam for 5 minutes after it starts to boil, making sure to skim off the foam with a slotted spoon (the foam is protein from the juice and makes the syrup cloudy). I take it off the heat and let the jam cool completely for 6–8 hours (overnight is fine). I repeat the boiling twice more, for 5 minutes each, with 6–8 hours between them. On the third boil I add the citric acid – it preserves the colour and prevents the jam from crystallising in storage.
I pour the hot jam straight into sterilised jars (I sterilise them in the oven at 120 °C for 15 minutes, or over steam) and seal them tightly with sterile lids. I turn them upside down to check the seal, then wrap them in a blanket for 12 hours until they cool completely.
The strawberry jam with whole berries is ready! The syrup is still thin for now – that is normal. Over time (1–2 months) it will thicken and become as stringy as honey – this is exactly what sets a properly cooked classic jam apart from modern "five-minute" versions.
Tips
- 1
Choose only firm, dense strawberries – soft ones will fall apart during cooking. The "Clery", "Alba" and "Honeoye" varieties are the most resilient.
- 2
The intervals between the three boils (6–8 hours) are the key secret to whole berries. Without the pauses the berries will boil down in the very first cooking.
- 3
Citric acid keeps the jam a bright red colour and prevents it from crystallising during long storage. I cook raspberry jam on a similar principle.
- 4
Be sure to skim off the foam during each boil – this is how the jam turns out clear and beautiful.
Video
FAQ
Why did my strawberry jam turn out thin? +
This is normal – freshly cooked jam is always thin. The syrup thickens in storage: after 2–4 weeks it becomes denser, and after 1–2 months it is as stringy as honey. This process is called "maturing". If the syrup is still thin after 2 months, there may have been too little sugar or not enough boils. The best ratio for thick jam is 1:1 (equal amounts of sugar and berries). Less sugar means a thinner jam that keeps less well.
Can it be made without citric acid? +
Yes, but the jam may crystallise during long storage (after 3–4 months the characteristic "crystals" appear). Citric acid also preserves the bright red colour – without it the jam becomes darker in storage. An alternative is a tablespoon of freshly squeezed lemon juice in the third boil. Acidic additions are an important technical element of properly made jam; do not skip them if you want long storage.
How long does strawberry jam keep? +
In properly sealed sterile jars in a cool dark place (a cellar or pantry), it keeps for up to a year without losing quality. Once opened, move the jar to the refrigerator and use it within a month. If mould appears on the surface, throw out the whole jar – do not try to remove just the top layer. The signs of good jam: a clear syrup with no cloudiness, whole berries, a bright ruby colour, and a thick, stringy texture after 1–2 months of storage.
What is strawberry jam best served with? +
Classic pairings: with hot tea alongside pancakes, fritters, syrniki and cottage cheese bakes. As a filling for pies and roulades, a topping for vanilla ice cream, yoghurt or cottage cheese. As a sweet sauce for panna cotta, cheesecake or sponge cakes. On bread and butter for breakfast. In marinades for meat (pork, duck), where it adds a characteristic sweet-and-sour accent. A versatile sweet preserve for the whole winter.
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