My delicious home-made plum jam is perfect spread on toast, crumpets or tea cakes. This quick and simple small-batch recipe produces a couple of delicious pots.
Easy Plum Jam
This plum jam recipe will convert you to jam making. It’s very simple to make, and I find that it takes only a few minutes at the stove, thanks to my favourite small batch method.
Fresh ripe plums are one of the great British soft fruits. They have a short season, so I enjoy them while I can and capture that flavour for the rest of the year by making jam.
Jam will keep safely for several years but it does lose its freshness and flavour over time. I don’t know about you, but the back of my cupboard used to hold far too many jars of ancient too-solid jams. So now I avoid this by making small batches, and enjoying the jam at its best. If I run out before the next season, I’ll enjoy something else instead.
We have used a red plum with a golden flesh for the jam, you can, of course use any type of plum.
Don’t I Need Pectin?
No. This plum jam recipe doesn’t use added pectin. The natural pectin in the fruit and the lemon juice sets it very well.
Jam or Conserve: What’s the Difference ?
When making jam, the fruit is sliced and then cooked before the sugar is added. This is necessary for fruit that need more cooking time.
For a conserve, whole raw fruit is left to stand in sugar to draw out the juice. The resulting mixture is then heated to a setting point. By doing this, you minimize the cooking time and keep the fresh flavours of the fruit. You also keep the shape of the fruit pieces. This plum jam recipe uses the conserve method.
My Easy Plum Jam Recipe
Step one – Cut the plums in half, remove the stones and cut off any bruises. Cut each half into abut 8 pieces. Put all the fruit in a bowl, and add the sugar.
If you have a glut of plums to use, but no time to make jam, you can freeze them at this point. Just make a note of the weight of plums and sugar used.
Step two – Cover the bowl and leave overnight to let the sugar draw the juice out of the fruit.
Step three – Sterilize clean jam jars and lids by placing them on a baking tray in the oven at 120°C/250°F/GM1. Transfer the plum and sugar mixture to a large saucepan or preserving pan, and simmer gently until all the sugar is dissolved. Add the lemon juice.
Step four – Once the sugar has dissolved, heat the mixture quickly to a rolling boil. Then start testing to see if will set. (See below for more information on this.)
Finally, let the plum jam cool for about ten minutes before you spoon it into the jars – this allows it to cool and thicken and will help stop all the pieces of fruit rising to the top, you want your fruit evenly distributed throughout the jam.
I ladle my jam into a toughened glass jug and pour into the jars through a jam funnel, which helps to stops any stray drips of jam.
Seal the lids while the jam is still hot. As it cools, you’ll hear the lids pop as the vacuum forms. It’s always a satisfying noise after a day with the preserving pan. Clean up any drips, stick on a label and you’re all done – delicious, easy plum jam.
Checking the Set
- First is by temperature; carefully check the jam with an accurate electronic thermometer. The liquid should reach 105°C/221°F. Once the jam has reached this temperature, you know that it should be ready. However use temperature as a guide, thermometers are inaccurate and a pan of boiling preserve will have some hot spots. Aways check using one of the other methods below.
- Second, the traditional test using a chilled plate. Before you start cooking, put a side plate in the freezer to chill. Once the jam is boiling, start testing by placing some jam on the plate and let it cool. When you push your finger through, look for a wrinkle ahead of your finger. Once you can see this, the plum jam is ready. This technique takes a bit of practice.
- Third, you can test for setting by checking the way that the jam runs off a spoon. Take a spoonful from the pan and turn it vertically so that the jam falls. If it all runs off, it won’t set. If, however, a little remains on the spoon in a sort of wide drip that doesn’t fall, then the jam is ready.
Again, this works best with some practice. The advantage of small batch jam is that by making little and often, you tune your senses as to when the jam is done and will be able to see when it is ready by its appearance when it is boiling.
- For more detailed notes on jam setting points, see my blackberry and apply jelly recipe.
With time you will be able to gauge setting point from the appearance, and sound, of the simmering jam.
If you are in doubt pot the jam – it is easier to remedy a soft set jam than an overset one.
How to check your jars have sealed
It is crucial to check your jars have sealed – you would have heard the little pops as the lid of each one was sucked in as it cooled.
Leave the jars out for 24 hours, and press the centre of each one. If the centre of the lid stays put it is sealed, and the jar can by put away.
If the centre of the lid pops up when released, it hasn’t sealed properly. If you have several unsealed jars you can open them all and re boil the jam, or if just one put it in the fridge and eat it immediately.
Easy Plum Jam – ingredient ratios
Making jams by ratio makes the recipes easy to scale up and down.
- Use the same weight of sugar as fruit.
- Use 1 tbsp lemon juice per 500 g of fruit.
- 250 g of fruit makes about 600 g of jam.
Easy Small Batch Plum Jam – Hints Tips and Variations
One of the reasons we love small batch preserving is that you can experiment with the recipe.
- Try a different type of plum, they all have slightly different flavours and come in a glorious spectrum of colours.
- Add some spices to mix up the flavour. Cinnamon, cardamon or ginger would all be delicious.
- If your set is too soft, then depending on how you can either boil the jam up again, and re-pot, or leave for a good few months as it will thicken in the jar.
- If the set is too solid, but the flavour is good, you can try adding some water and re-cook, but it is easy to caramelise the sugar.
- Add a little water, heat up and serve on ice cream or pancakes
- Melt the jam, whisk with vinegar and BBQ sauce for a fruity BBQ glaze or marinade.
- Beat it into buttercream for a fruit flavoured frosting.
- If the jam has started to caramelise, you usually can’t rescue it and I’d throw it away.
- My jam has gone mouldy? This can happen for a number of reasons. The jar didn’t seal properly. You didn’t sterilise the jars, or you used bruised or damaged fruit. Throw the jam away – the mould goes far beneath the surface.
How long does plum jam last?
If you have made the jam properly with quality fruit, and the lid has sealed properly, your jam should last for years stored in a cool dark cupboard. It will thicken and darken over time.
Once opened I store jam in the fridge, this is largely due to a lack of cupboard space, and that we have several pots on the go at once. Homemade jam will be fine in a cupboard for 4 weeks after opening.
Easy Plum Jam – Conserve Method
- 450 g plums
- 450 g sugar
- 2 tbsp lemon juice
- Cut the plums into four and remove the stones.
- Put the fruit in a bowl and cover with the sugar. Add the lemon juice and stir. Cover the bowl and leave overnight so that the sugar draws out the juices.
- Transfer to a good sized saucepan (one that can hold twice the volume of liquid). Heat gently to dissolve the sugar.
- Turn the heat up high and bring the jam up to a rolling boil until it reaches the setting point of 105°C. Test for set by placing a teaspoonful of jam onto a chilled plate, or use one of the other methods for testing the set.
- Once the jam has reached setting point, take the pan off the heat and allow to cool for a few minutes. Spoon the jam into the prepared warm jars (a jam funnel helps avoid mess) and seal with the lids before the jam cools. Once cool, label the jars and store in a cool, dry place.
- Makes 2–3 jars
- This recipe is 3 Weight Watchers Smart Points per portion