Berries · Fruit Redcurrant
Redcurrant Jelly: The Benchmark Set Every Jam Maker Needs
Published 1 Sep 2026 · Reading time 4 min
Why this one works
Redcurrants are the most reliable jelly fruit that grows in a temperate garden: pectin so abundant that a litre of juice gels with nothing added, and enough acid to set at a pH where no mould can grow. Make this once and you have a reference for what a proper set feels like.
In the pan
- 1.5 kg redcurrants, stripped from the stalks with a fork
- 1.2 L water
- 700 g granulated sugar per litre of strained juice
- No pectin, no lemon — this fruit does not need either
The numbers
- Family
- Berries
- Fruit
- Redcurrant
- Pectin source
- Natural — no additions needed at all
- Sugar ratio
- 1 L juice : 700 g sugar
- Target Brix
- 65 Brix
- pH
- 2.9
- Gel point
- 104 °C
- Sealing
- Boiling water bath
- Shelf life
- 24 months
- Crystal risk
- Low
- Yield
- 5 x 250 ml jars
- Time at the pan
- 20 min
Three stages
Prep — no need to top and tail, just strip
Run a fork down each strig and the berries drop off clean; picking them one by one is 25 minutes of work for no difference in the finished jelly. There is no need to top and tail the fruit either, because the calyx and stalk end up in the bag and never in the jar.
Simmer the berries and the water for 25 minutes with the lid on, mashing them against the side of the pan with a potato masher at the halfway point. Redcurrant skins are tough and hold onto a surprising amount of pectin; the mash is what releases it.
Cook — drip for 3 hours, then a very short boil
Tip everything into a jelly bag and let it drip for 3 hours without any pressure at all. Redcurrant juice carries so much pectin that pressing the bag releases fine pulp, and pulp in a redcurrant jelly reads as sandiness on the tongue — the one defect this fruit is prone to.
Measure the juice, add 700 g sugar per litre, and boil hard to 104 °C. This happens fast, often in under 12 minutes, so stay at the pan with the thermometer in. Skim once, add nothing else, and pot. Redcurrant jelly tastes sharp and clean precisely because nothing has been added to round it off; resisting the urge to add lemon or a herb is the whole recipe.
Seal — 10 minutes, and it will keep for two years
Pot hot at 90 °C into 250 ml jars with a 6 mm headspace and process for 10 minutes in a boiling water bath. At pH 2.9 with 65 Brix, this is the most stable preserve in the collection and the only one where a two-year shelf life is a conservative estimate rather than an optimistic one.
Cool upright and undisturbed. Do not jiggle the jars to see whether it has started to set; a redcurrant jelly that is agitated above 40 °C will show a permanent fault line down the middle of the jar.
Failure diagnosis
Four things go wrong with this preserve more often than anything else. Open the one you are looking at.
Will not set
Practically impossible with this fruit, so if it happens the juice was over-diluted by rinse water. Boil it down hard and retest every 3 minutes — a jelly that will not set at 65 Brix almost always sets by 68.
Graining and crystals
Very low risk. The acid is high enough that sucrose inversion happens naturally during the boil, and inverted sugar does not crystallise. Keep the boil under 20 minutes and you will never see a grain.
Mould or spoilage
Mould on a 65 Brix, pH 2.9 jelly can only mean a failed seal. Check every lid the morning after by pressing the centre; a lid that pops back means the jar goes in the fridge, and it will still be good for three months there.
Colour loss
The brilliant red is anthocyanin and it goes to a deep garnet over about 18 months, which most people find just as attractive. Light speeds this up more than heat does, so a dark cupboard is worth more than a cool one.
On the same shelf
Other berries recipes, all already published.
Recipes here are for home preserving and are informational only. Canning safety depends on your altitude, your jars and your thermometer — verify with your local extension service before relying on any single number.