Foolproof Homemade Jam Recipe (Works with Almost Any Fruit)

There is something incredibly satisfying about making your own jam. Whether you’re using homegrown fruit, a glut from the garden, or simply making the most of seasonal produce, this simple recipe gives you a beautifully set jam every time.

The best part? Once you know the ratio, you can adapt it to almost any fruit.

Our Foolproof Jam Formula

Equal weight of fruit
Equal weight of jam sugar (with added pectin)
Juice of half an orange
Cook to 105°C

That’s it.

Using jam sugar with added pectin takes all of the guesswork out of jam making. Different fruits naturally contain different amounts of pectin, which is why traditional recipes can sometimes be unpredictable. By using pectin sugar, you’ll achieve a reliable, perfectly set jam every time.

The Recipe Featured on Our YouTube Channel

For this recipe we used:

250g rhubarb
250g raspberries
500g jam sugar with added pectin
Juice of half an orange

Simply place everything into a saucepan, bring to the boil and cook until the mixture reaches 105°C.

We recommend using a digital food thermometer, just as we do in the video, to remove all the guesswork. Once the jam reaches temperature, it’s ready to pot.

Why Add Orange Juice?

Every good jam needs a little acidity.

The orange juice isn’t there to make your jam taste of orange. Its job is to balance the sweetness while helping activate the pectin, giving you that beautiful glossy finish and firm set.

Sterilise Your Jars

Before filling your jars, make sure they have been properly sterilised.

A simple way is to wash them thoroughly before pouring boiling water over both the jars and lids. Allow them to drain and dry before filling with your hot jam.

Clean jars help maximise shelf life and keep your homemade preserves at their best.

A Recipe You Can Use Again and Again

Once you’ve mastered this method, you can experiment with almost any fruit throughout the seasons.

Try strawberries, blackberries, plums, blueberries, gooseberries, apricots or mixed berries. As long as you keep the same simple formula and use jam sugar with added pectin, you’ll produce consistently delicious homemade jam every time.

It’s one of those recipes every home cook should have in their repertoire.

If you’d like to watch the complete step-by-step process, including exactly how we check for the perfect setting point at 105°C, head over to our YouTube channel where we make this rhubarb and raspberry jam from start to finish.

Happy jam making—and as we always say at Winchester Cookery School, great cooking doesn’t have to be complicated.