Traditional Strawberry Jam
Traditional strawberry jam is built on a precise balance of fruit, sugar, and the natural acid of lemon. By cooking the berries until they release their juices and then reaching the setting point, you concentrate the strawberry flavor without the need for commercial additives.
Patience is your primary ingredient.
Jam making is a process of evaporation and chemical reaction; do not rush the boil or you will end up with syrup instead of a set spread.
- Heavy-bottomed wide pot
- Small plate kept in the freezer
- Canning jars with new lids
- Water bath canner
What goes in.
- 4 lbfresh strawberries, hulled and quartered
- 4 cupsgranulated white sugar
- 1/4 cupfresh lemon juice
Knowing when it's finished
Place a teaspoon of jam on your frozen plate and let it sit for a minute; push it with your finger, and if the surface wrinkles, the jam is ready to jar.
The method.
Macerate the fruit
Toss the strawberries and sugar in the pot. Let them sit for at least one hour until the sugar dissolves and the berries release their liquid.
Begin the cook
Set the pot over medium-high heat. Stir constantly until the sugar is fully incorporated and the mixture reaches a rolling boil.
Reduce the jam
Add the lemon juice. Maintain a steady boil, skimming off any foam that rises to the surface with a metal spoon, until the mixture darkens to a deep ruby red.
Test for set
Once the jam thickens and looks glossy, pull the pot from the heat and perform the cold plate test.
Fill and process
Ladle the hot jam into sterilized jars, leaving a quarter-inch of headspace. Process in a boiling water bath for 10 minutes to seal.
Other turns to take.
Strawberry-Vanilla
Split one vanilla bean and scrape the seeds into the pot during the initial maceration stage for a floral depth.
Strawberry-Black Pepper
Add a half-teaspoon of freshly cracked black pepper in the final five minutes of boiling to balance the natural sweetness.
When it doesn't go to plan.
Use a wide pot to increase surface area, which helps the water evaporate faster and preserves the bright color of the berries.
Do not double the batch; larger volumes take too long to boil, causing the fruit to lose its shape and flavor.
If the jam does not set after testing, boil it for another two minutes and test again; the sugar concentration is likely just a fraction too low.
The ones that keep coming up.
Why did my jam turn brown?
Overcooking is the culprit. Once you hit the setting point, remove the pot from the heat immediately.
Can I use less sugar?
Sugar acts as a preservative and a stabilizer for the set; reducing it significantly will result in a runny product that won't hold its structure.
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