Blueberry Rhubarb Jam
This Blueberry Rhubarb Jam is a sweet-tart preserve bursting with fresh fruit flavor, perfect for spreading on toast, swirling into yogurt, or gifting in beautiful jars.
The Sweet-Tart Preserve You Will Want to Make Every Summer
There is something deeply satisfying about turning a pile of fresh summer fruit into something you can enjoy all year long. This Blueberry Rhubarb Jam is one of those recipes that feels a little old-fashioned in the best possible way. It is vibrant, jewel-toned, and layered with flavor. The blueberries bring a deep, jammy sweetness while the rhubarb cuts through with that signature tartness that makes every bite interesting.
If you have never made jam before, this is an excellent place to start. The process is straightforward, the ingredients are simple, and the payoff is enormous. A single batch fills several jars, and those jars make genuinely wonderful gifts.
Why Blueberry and Rhubarb Work So Well Together
Blueberries and rhubarb are one of those classic pairings that make sense the moment you taste them. Blueberries are naturally sweet and aromatic, with a soft texture that breaks down beautifully in a jam. Rhubarb is sharp, almost floral, and fibrous enough to give the jam a little body without any added thickener.
Together, they balance each other out completely. You get a jam that is not cloyingly sweet and not puckering sour. It is just right, especially with a generous smear of butter on a warm biscuit.
A splash of fresh lemon juice and zest ties everything together, brightening the flavors and helping with the natural set.
Having the right equipment makes jam-making so much more enjoyable and stress-free. A heavy-bottomed pot prevents scorching, a reliable candy thermometer takes the guesswork out of the set, and quality canning jars mean your preserves stay sealed and shelf-stable all year.
Tools & Ingredients We Recommend
Tips for the Best Homemade Jam
A few things will take your jam from good to genuinely great:
- Use ripe but not overripe fruit. Slightly underripe fruit has more natural pectin, which helps the jam set.
- Do not rush the sugar dissolving step. Make sure the sugar is fully dissolved before you crank up the heat or you risk a grainy texture.
- Stir constantly once the sugar is in. Jam scorches quickly, especially as it thickens.
- Trust the thermometer. The cold plate test is a helpful backup, but 220 degrees F is your most reliable indicator of a proper set.
Chef's Tip: Warm your jars in a low oven or in hot water before ladling in the jam. Cold jars can crack when they meet hot jam, and warm jars also help the jam settle without air pockets.
How to Use Blueberry Rhubarb Jam
Once you have a few jars of this in your pantry, you will find yourself reaching for them constantly. The obvious choice is on toast or an English muffin, but do not stop there. Swirl it into plain yogurt or oatmeal in the morning. Spoon it over a wheel of brie before baking. Use it as a filling for thumbprint cookies or a layer in a simple Victoria sponge. It is also brilliant alongside roasted pork or duck if you enjoy a fruit-forward sauce with savory dishes.
Ready to make a batch? Here is everything you need:
Blueberry Rhubarb Jam
This Blueberry Rhubarb Jam is a sweet-tart preserve bursting with fresh fruit flavor, perfect for spreading on toast, swirling into yogurt, or gifting in beautiful jars.
Ingredients
- 3 cups fresh blueberries, rinsed and sorted
- 2 cups rhubarb stalks, trimmed and cut into 0.5-inch pieces
- 2 1/2 cups granulated sugar
- 2 tbsp fresh lemon juice, from about 1 large lemon
- 1 tsp lemon zest, finely grated
- 1 tbsp powdered fruit pectin, optional, for a firmer set
Instruction
Combine the blueberries, rhubarb, lemon juice, and lemon zest in a large heavy-bottomed saucepan over medium heat. Stir to combine.
Cook the fruit mixture, stirring frequently, for about 10 minutes until the rhubarb softens and the blueberries begin to burst and release their juices.
If using pectin, whisk it into the sugar before adding. Add the sugar to the saucepan and stir well to dissolve completely.
Increase the heat to medium-high and bring the mixture to a full rolling boil that cannot be stirred down, stirring constantly.
Boil hard for 1 to 2 minutes, then reduce heat to medium and continue cooking, stirring frequently, for 20 to 25 minutes until the jam thickens and reaches 220 degrees F (104 degrees C) on a candy thermometer.
To test the set without a thermometer, place a small spoonful on a chilled plate. After 30 seconds, run your finger through it. If it wrinkles and holds its shape, the jam is ready.
Remove from heat and skim off any foam from the surface with a spoon.
Ladle the hot jam into clean, sterilized jars, leaving 0.25-inch headspace. Wipe the rims clean, seal with lids, and process in a boiling water bath for 10 minutes for shelf-stable preservation, or allow to cool and refrigerate for immediate use.
Equipment
- Large heavy-bottomed saucepan or Dutch oven
- Candy thermometer
- Wooden spoon or heat-safe silicone spatula
- Ladle
- Canning jars with lids and bands
- Jar lifter
- Large stockpot for water bath canning
- Chilled plate (for set testing)
Notes
Storing and Canning Your Jam
For the longest shelf life, process your filled jars in a boiling water bath for 10 minutes. Properly sealed jars will keep in a cool, dark spot for up to 12 months. You will hear that satisfying pop as the lids seal while the jars cool on your counter, which is one of the most rewarding sounds in home cooking.
If canning feels like a step too far right now, simply let the jars cool to room temperature and pop them in the refrigerator. They will keep beautifully for about four weeks, which is honestly plenty of time to work through a few jars.
