Fresh Strawberry Jam
This is a low-yield, high-reward method for capturing the bright, tart flavor of summer. You are not looking for a firm jelly, but a loose, spoonable preserve that keeps the berries intact and vibrant.
Watch the cold plate
The secret is in the temperature check, not the timer. Keep a small saucer in the freezer to test the set of your jam while you work.
- wide, heavy-bottomed stainless steel pot
- potato masher
- chilled saucer
- canning jars with new lids
What goes in.
- 2 lbfresh strawberries, hulled and quartered
- 1.5 cupsgranulated sugar
- 2 tbspfresh lemon juice
Testing for the set
Drop a teaspoon of the boiling liquid onto your frozen saucer. If it wrinkles when you push it with your finger instead of running like syrup, the jam is ready.
The method.
Macerate the fruit
Toss the strawberries with the sugar and lemon juice in the pot. Let them sit for 30 minutes until the berries release their juices and the sugar is mostly dissolved.
Initial boil
Bring the mixture to a rolling boil over medium-high heat. Skim off the light pink foam that rises to the surface with a metal spoon; this keeps the jam clear.
Reduce and thicken
Turn the heat to medium. Use a potato masher to break down about half of the berries, leaving the rest in chunky pieces. Boil, stirring frequently to prevent sticking, until the liquid thickens and bubbles become heavy and slow.
Verify and jar
Perform the gel test on your cold plate. Once it sets, remove from heat and let rest for five minutes before ladling into clean, warm jars.
Other turns to take.
Vanilla Bean
Split half a vanilla bean and scrape the seeds into the pot at the start of the boil for a floral depth.
Black Pepper
Add a half-teaspoon of freshly cracked black pepper in the last five minutes of cooking to cut through the sweetness.
When it doesn't go to plan.
Use a wide pot rather than a deep one; the larger surface area helps the water evaporate faster, preserving the bright red color.
Never double the batch size in one pot, as the extended cooking time will turn the jam brownish and muddy.
If you are not pressure canning, store these jars in the refrigerator and use them within three weeks.
The ones that keep coming up.
Why is my jam runny?
The jam likely didn't reach the proper temperature to concentrate the sugar and natural pectin. If it fails the plate test, return it to the pot and boil for another five minutes.
Do I need to add pectin?
No. Strawberries have enough natural pectin and acidity to set on their own if boiled correctly with the right sugar ratio.
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