Blackberry peach jam is a delightful blend of sweet, juicy peaches and tart blackberries, creating a perfectly balanced preserve that bursts with summer flavor. This jam works wonderfully because the natural pectin in blackberries helps it set, while the peaches add a smooth, fragrant sweetness that complements the berries’ tang. Whether spread on toast or swirled into yogurt, this homemade jam captures the essence of fresh fruit in every spoonful.
Ingredients
- 3 cups fresh blackberries (about 1 pint)
- 3 cups peeled and diced peaches (about 3 medium peaches)
- 4 cups granulated sugar
- 2 tablespoons freshly squeezed lemon juice
- 1 packet (1.75 ounces) fruit pectin (optional, for firmer set)
- 1/4 teaspoon butter (optional, reduces foaming)
Instructions
- Prepare the fruit: Rinse blackberries gently under cold water and drain. Peel peaches by blanching them briefly in boiling water (about 30 seconds), then transferring to ice water; the skins should slip off easily. Dice peaches into small pieces.
- Macerate the fruit: In a large bowl, combine blackberries, diced peaches, and lemon juice. Stir in the sugar and let the mixture sit for 30 minutes to an hour, allowing the sugar to draw out the juices and soften the fruit.
- Cook the jam: Transfer the fruit and sugar mixture to a heavy-bottomed saucepan. If using pectin, stir it into the mixture now. Add the butter if desired to reduce foaming. Bring the mixture to a full rolling boil over medium-high heat, stirring constantly.
- Boil and test for set: Once boiling, continue to cook for about 10-15 minutes, stirring frequently to prevent sticking. To test if the jam is ready, place a small spoonful on a chilled plate and let it sit for a minute. Push the edge of the jam with your finger; if it wrinkles and holds its shape, it’s set. If not, continue boiling and test every 2-3 minutes.
- Jar the jam: While the jam is cooking, sterilize your jars and lids by boiling them for 10 minutes or running them through a dishwasher cycle. Ladle the hot jam into the sterilized jars, leaving about 1/4 inch headspace.
- Seal and process: Wipe rims clean, apply lids, and screw on bands until fingertip-tight. Process jars in a boiling water bath for 10 minutes to ensure proper sealing and preservation.
- Cool and store: Remove jars from the water bath and let them cool undisturbed for 12-24 hours. Check seals by pressing the center of each lid—if it doesn’t pop back, the jar is sealed. Store sealed jars in a cool, dark place.
Tips
- Substitutions: You can substitute nectarines for peaches if preferred; just peel and dice them similarly. For a lower sugar version, use a low-sugar pectin and adjust sugar quantity accordingly, but note this may affect shelf life.
- Preventing foam: Adding a small amount of butter during cooking helps reduce foam, which can interfere with jar sealing and cause messes.
- Common mistakes: Not sterilizing jars properly can lead to spoilage. Also, rushing the boiling process or not testing for set can result in jam that’s too runny or overly stiff.
- Choosing fruit: Use ripe but firm fruit for best texture and flavor. Overripe peaches or blackberries may produce too much liquid and affect the jam’s consistency.
Serving Suggestions
Blackberry peach jam is incredibly versatile. Spread it on warm buttered toast, swirl it into plain Greek yogurt or oatmeal for a fruity boost, or use it as a filling for thumbprint cookies and pastries. It also pairs wonderfully with soft cheeses like brie or cream cheese on a charcuterie board. For a summery twist, drizzle it over vanilla ice cream or pancakes for a fresh, homemade topping.
Variations
To customize this jam, consider adding a splash of vanilla extract or a cinnamon stick during cooking to infuse warm spice notes. For a boozy version, stir in a tablespoon of bourbon or brandy after removing the jam from heat. You can also experiment by replacing blackberries with raspberries or blueberries for a different berry profile. For a less sweet spread, reduce sugar by 1 cup and compensate with a bit more lemon juice to maintain acidity and help with preservation.
Storage and Reheating
Properly sealed and processed jars of blackberry peach jam can be stored unopened in a cool, dark pantry for up to one year. Once opened, keep the jam refrigerated and consume within 3 to 4 weeks for best quality. Homemade jam does not require reheating before use, but if you prefer it warm, gently heat a small amount in a saucepan or microwave-safe bowl until just warm, stirring to prevent scorching. Avoid overheating, as this can degrade the flavor and texture.
Frequently Asked Questions
Can I make blackberry peach jam without pectin?
Yes, you can make jam without commercial pectin, but it may take longer to set and result in a softer texture. Blackberries naturally contain some pectin, so combined with the peaches and sufficient cooking time, the jam will still thicken. Just be sure to test for set as you cook.
How do I know when my jam is fully set?
The best way is the chilled plate test: place a small spoonful of hot jam on a cold plate, let it cool for a minute, then push it with your finger. If the surface wrinkles and doesn’t flood back, it’s ready. If it’s still runny, continue boiling and retest every few minutes.
Can I freeze this jam instead of canning?
Yes, freezing is a simple alternative to canning. Pour cooled jam into freezer-safe containers, leaving some headspace for expansion. Frozen jam maintains flavor well for up to 6 months. Thaw in the refrigerator before use. Note that freezing may slightly alter the texture, making it less firm than canned jam.
What if my jam doesn’t set?
If your jam remains runny after cooking, you can try recooking it to reduce excess liquid further. Alternatively, add a bit more pectin following the package instructions and boil again. Make sure to test fruit ripeness and acidity, as under-ripe fruit or insufficient lemon juice can affect setting.
Is it necessary to process jam in a water bath?
Processing in a boiling water bath is recommended for shelf stability and food safety, especially if you want to store jam unrefrigerated. It helps kill bacteria and creates a vacuum seal. If you plan to consume the jam quickly and keep it refrigerated, you can skip this step, but the shelf life will be shorter.
Can I use frozen fruit for this recipe?
Frozen fruit can be used, but it’s best to thaw and drain excess liquid before cooking to avoid overly watery jam. The texture might be slightly softer, and cooking times may need to be adjusted. Using fresh fruit generally yields the best flavor and texture.
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