Small-Batch Strawberry Jam
Making jam is about managing water content and sugar concentration. When you get the balance right, the fruit retains its bright color and holds a soft set without becoming a stiff jelly.
Watch the temperature, not the clock.
Jam thickens based on the sugar-to-pectin reaction, which requires a specific heat threshold. Relying on a candy thermometer is more reliable than guessing the consistency by sight alone.
- Wide-mouth heavy-bottomed pot
- Candy thermometer
- Canning jars with new lids
- Water bath canner or deep stockpot
- Jar lifter
What goes in.
- 2 lbfresh strawberries, hulled and halved
- 2 cupsgranulated sugar
- 2 tbspfreshly squeezed lemon juice
Checking the gel
Keep a small saucer in the freezer. When you think the jam is ready, drop a teaspoon of hot jam onto the frozen plate, wait a moment, and push it with your finger; if it wrinkles, the pectin has bonded.
The method.
Macerate the fruit
Toss the strawberries and sugar in the pot. Let them sit for 30 minutes until the sugar draws the juice out of the berries.
Bring to a boil
Place the pot over medium-high heat. Stir consistently with a silicone spatula to prevent the sugars from scorching on the bottom.
Cook to temp
Once boiling, add the lemon juice. Keep the boil rolling until the thermometer reads 220°F. Skim off any white foam that gathers on the surface during this time.
Test and fill
Perform the cold plate test. Once set, remove from heat and ladle into hot, sterilized jars, leaving a quarter-inch of space at the top.
Process
Wipe the rims clean, secure the lids, and submerge the jars in a boiling water bath for 10 minutes.
Other turns to take.
Vanilla Bean
Split one vanilla bean and scrape the seeds into the pot during the initial maceration.
Balsamic Black Pepper
Add one tablespoon of aged balsamic vinegar and a half-teaspoon of cracked black pepper in the last three minutes of boiling.
When it doesn't go to plan.
Use fruit that is just barely ripe; overripe fruit lacks the natural pectin needed for a firm set.
Never substitute sugar with honey or liquid sweeteners, as these alter the chemical reaction required for gelling.
Store jars in a cool, dark place to maintain the bright red color of the berries.
The ones that keep coming up.
Why is my jam runny?
Usually, the temperature did not reach 220°F. If you miss the mark, you can return it to the pot and boil it for a few more minutes.
Do I have to use lemon juice?
The acid is necessary to activate the natural pectin in the strawberries and helps the sugar hold the structure.
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