Making Fruit Jam
Fruit jam is the reduction of fruit, sugar, and acid until the mixture hits the gel point. By simmering the components, you evaporate enough water to concentrate the natural pectins, creating a spread that sets firmly once cooled without needing anything but patience and heat.
Watch the temperature, not the clock.
Jam requires precision to move past a syrupy consistency into a spreadable set. Keep a plate in the freezer from the start; you will need it to verify your set.
- wide, heavy-bottomed stainless steel pot
- silicone spatula
- canning jars with new lids
- canning rack or deep pot with a towel at the bottom
What goes in.
- 4 cupscrushed seasonal fruit
- 2 cupsgranulated white sugar
- 2 tbspbottled lemon juice
The Freezer Plate Test
When the jam looks thick and the bubbles slow down, drop a small spoonful onto your frozen plate. If you can push your finger through the puddle and the surface wrinkles without running, it is finished.
The method.
Prepare the fruit
Mash the fruit in the pot using a potato masher. You want a mix of small chunks and juices to ensure even pectin release.
Dissolve the sugar
Add the sugar and lemon juice over low heat. Stir constantly until the grains vanish completely before turning the flame to high.
Boil hard
Bring the mixture to a rolling boil. Do not stop stirring; the sugar can easily scorch at the bottom of the pot.
Test for set
Once the jam turns dark and glossy, perform the plate test. If it runs, boil for another two minutes and repeat.
Jar and seal
Ladle the hot jam into sterilized jars, leaving a quarter-inch of space at the top. Process in boiling water for ten minutes to create a vacuum seal.
Other turns to take.
Low-Sugar Jam
Add a commercial powdered pectin designed for low-sugar recipes, as the jam will not set through sugar concentration alone.
Herbal Infused
Steep a sprig of thyme or basil in the fruit for five minutes while heating, then remove before boiling.
When it doesn't go to plan.
Use a wide pot to increase surface area, which helps evaporation and speeds up the process.
If the jam fails to set, it is essentially a fruit syrup; store it in the fridge and use it over yogurt.
Always use fresh, slightly under-ripe fruit if possible, as it contains higher natural pectin levels.
The ones that keep coming up.
Why did my jam turn brown?
The sugar cooked too long, leading to caramelization. Keep the boil rapid and monitor the color closely.
Can I reduce the sugar amount?
Sugar is structural in traditional jam. If you reduce it without using commercial pectin, the jam will remain liquid.
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