Blueberry Jam

Blueberry Jam

Blueberry jam is a delightful way to capture the sweet and slightly tart flavor of fresh blueberries in a jar. Whether spread on toast, layered into cakes, or spooned over pancakes, blueberry jam adds a burst of color and flavor to any dish.

This homemade recipe uses simple ingredients, and by following a few key steps, you can create a luscious jam with a perfect consistency.

Ingredients:

• 4 cups (600g) fresh blueberries (or frozen if out of season)
• 3 cups (600g) granulated sugar
• 2 tablespoons fresh lemon juice
• 1 teaspoon lemon zest (optional, for added flavor)
• 1 tablespoon unsalted butter (optional, to reduce foam)

Equipment:

• Large pot or Dutch oven
• Potato masher or wooden spoon
• Sterilized canning jars with lids
• Canning funnel (optional)
• Candy thermometer (optional)
• Ladle
• Clean cloths for wiping the jar rims

Step 1: Prepare the Blueberries

Start by washing the blueberries thoroughly under cold water, removing any stems, leaves, or debris. If you’re using frozen blueberries, let them thaw completely and drain any excess water before starting.

Place the blueberries in a large pot or Dutch oven. Using a potato masher or a wooden spoon, gently crush the blueberries. The goal is to break down some of the berries to release their juice, but leaving a few whole berries will give the jam a nice texture.

Step 2: Add Sugar and Lemon Juice

Once the blueberries are mashed, add the granulated sugar to the pot. Stir to combine, allowing the sugar to start dissolving into the blueberry juice.

Next, add the lemon juice. The acidity from the lemon juice not only balances the sweetness of the blueberries but also helps the jam set because it activates the natural pectin in the fruit. For a touch of extra flavor, you can also add 1 teaspoon of finely grated lemon zest, which will give the jam a bright, citrusy note.

Step 3: Cook the Jam

Place the pot over medium heat and bring the mixture to a boil, stirring constantly to prevent burning. Once the mixture reaches a rolling boil, reduce the heat to medium-low and allow the jam to simmer gently for about 20–30 minutes.

As the jam cooks, it will thicken gradually. Stir frequently to prevent it from sticking to the bottom of the pot. Blueberries naturally have a high water content, so the jam will reduce as the water evaporates.

If foam forms on top of the jam, you can skim it off with a spoon. Adding 1 tablespoon of unsalted butter will help reduce the foam, which can give the jam a clearer appearance, but this step is optional.

Step 4: Test for Doneness

To check if your blueberry jam has reached the right consistency, use one of these two methods: the candy thermometer or the plate test.

Candy Thermometer: The jam is ready when it reaches 220°F (105°C). At this temperature, the jam will set properly when cooled.

Plate Test: If you don’t have a thermometer, place a small plate in the freezer at the beginning of the cooking process. When you think the jam is ready, spoon a small amount onto the chilled plate and let it sit for a minute. If the jam wrinkles when you push it with your finger, it’s ready. If it’s still runny, cook the jam for a few more minutes and test again.

Step 5: Sterilize and Fill Jars

While the jam is cooking, sterilize your canning jars and lids. Wash them in hot, soapy water, then boil them in water for 10 minutes to ensure they’re clean and safe for preserving. Let the jars dry on a clean towel.

When the jam reaches the desired consistency, remove it from the heat and let it cool slightly. Using a ladle and a canning funnel, carefully fill the jars with the hot jam, leaving about ¼ inch of space at the top. Wipe the rims of the jars with a clean cloth to remove any spilled jam and ensure a good seal.

Step 6: Seal the Jars

To preserve your blueberry jam for long-term storage, process the filled jars in a water bath. Place the jars in a large pot of boiling water, ensuring they are completely submerged, and boil for 10 minutes. This creates a vacuum seal that helps preserve the jam.

After boiling, carefully remove the jars from the water and let them cool on a towel. As they cool, you’ll hear the lids pop, indicating that they’ve sealed properly. If a jar doesn’t seal, refrigerate it and use it within a few weeks.

Step 7: Store and Enjoy

Once the jars have cooled completely and sealed, store them in a cool, dark place for up to a year. Once opened, keep the jam in the refrigerator and consume it within a few weeks. This blueberry jam is perfect for spreading on toast, using as a filling for cakes, or serving with cheese.

Tips for Perfect Blueberry Jam:

Sugar: The amount of sugar used in jam-making is essential for both flavor and preservation. Reducing the sugar too much can affect the jam’s shelf life and consistency.

Pectin: Blueberries naturally contain pectin, but if you prefer a firmer jam, you can add store-bought pectin. Simply follow the instructions on the package.

This simple yet delicious homemade blueberry jam recipe is a great way to enjoy the bounty of summer berries all year round!

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