How to make strawberry jam
Homemade strawberry jam is perfect for spreading on toast or giving as a gift. Use fresh strawberries to make a delicious preserve with our simple step-by-step guide.
Sometimes there's nothing tastier than a slice of toast with homemade strawberry jam, packed with fresh fruit. Store-bought versions are full of sugar and artifical flavourings, so instead follow James Martin's easy guide to making a homemade version without the hassle.
Read our review of the best jam making equipment to get yourself started.
Step-by-step guide to making strawberry jam
Follow these steps, using ingredients and quantities from our strawberry jam recipe.
Step one:
Prepare the strawberries by wiping them with a piece of damp kitchen paper. (Wiping the strawberries rather than washing them ensures the fruit doesn't absorb lots of water - too much water and the jam won't set easily.) To hull the fruit, use a knife to cut a cone shape into the strawberry and remove the stem. Cut any large berries in half.
Step two:
Put the strawberries in a bowl and gently toss through the sugar. Leave uncovered at room temprature for 12 hrs or overnight. This process helps the sugar to dissolve, ensures the fruit doesn't disintegrate too much and helps to keep its vibrant colour.
Step three:
Before starting the jam, put 2 saucers in the freezer. Tip the strawberry mixture into a preserving pan with the lemon juice. Set over a low heat and cook very gently. If any sugar remains on the sides of the pan, dip a pastry brush in hot water and brush the sugar away.
Step four:
When you can no longer feel any grains of sugar remaining, turn up the heat to start bubbling the jam and bringing it to the boil. (The sugar must be completely dissolved before increasing the heat, otherwise it will be difficult for the jam to set, and it may contain crystallised lumps of sugar.)
Step five:
Boil hard for 5-10 mins until the jam has reached 105C on a preserving or digital thermometer, then turn off the heat. If you don't have a thermometer, spoon a little jam onto one of the cold saucers. Leave for 30 secs, then push with your finger; if the jam wrinkles and doesn't flood to fill the gap, it is ready. If not, turn the heat back on and boil for 2 mins more, then turn off the heat and do the wrinkle test again. Repeat until ready.
Watch our video for more tips on how to test jam.
Step six:
Use a spoon to skim any scum that has risen to the surface and discard this. Do this only once at the end, rather than constantly during the boiling stage, to reduce wastage.
Step seven:
Add a knob of butter, if you like, to the finished jam, and stir in to melt. This will help to dissolve any remaining scum that you haven't managed to spoon off the top. Leave the jam to settle for 15 mins - this will ensure that the fruit stays suspended in the mixture and doesn't float to the top of the jam jar. Meanwhile, sterilise your jars.
Step eight:
Ladle into warm jars, filling to just below the rim. Place a waxed paper disc on top of the jam (this prevents mildew forming), then cover with a lid or a cellophane circle and elastic band. Pop on a label (include the date), plus a pretty fabric top, if you like. The jam can be stored for up to 1 year in a cool, dry place. Refrigerate after opening.
James will be at the Good Food Show Summer from 12th-15th June 2025 at the NEC, Birmingham. Come along to see him cooking live, plus listen in to his interview on the Let’s Talk Good Food Stage. Your chance to pick up tips from the man himself!
Find out more and book tickets on the Good Food Show website.
Get more jam inspiration:
Top tips for making jam
Best jam making kit on test
How to sterlise jars
How to test jam
Our best jam recipes
This tasty jam deserves a bread that's just as good - this easy white bread recipe is perfect for both bread machines and making the traditional way.
Have you made our strawberry jam? Leave a comment below...
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