Introduction
I make this seedless blackberry jam every summer when fresh blackberries are at their peak and I want all that rich, deep flavor without any of the seeds getting stuck in my teeth. Running the cooked berries through a fine mesh strainer takes just a couple of extra minutes but completely transforms the texture into something incredibly smooth and spreadable. Three simple ingredients — blackberries, sugar, and lemon juice — is all it takes to make a glossy, thick jam that tastes nothing like anything from a store jar. This works great on toast, biscuits, pancakes, stirred into yogurt, or spooned over ice cream.
How to Make Seedless Blackberry Jam (Quick Overview)
To make this seedless blackberry jam, cook blackberries with sugar and lemon juice until soft and broken down, then press through a fine mesh strainer to remove all the seeds. Return the smooth puree to the saucepan and cook down until thick and glossy. Pour into clean jars and refrigerate. The whole process takes about 35 minutes.
About the Ingredients
Fresh Blackberries
Fresh blackberries give this seedless blackberry jam its deep, intense flavor and natural dark color. The natural pectin in the berries — concentrated in the seeds and skin — helps the jam thicken without adding any store-bought pectin. Frozen blackberries also work well, just use them straight from frozen and add a couple of extra minutes of cooking time.
Sugar
Sugar sweetens the jam and plays a crucial role in helping it reach the right thick, spreadable consistency. Don’t reduce the sugar by too much in this easy three ingredient blackberry jam recipe — it’s not just for sweetness, it also helps the jam gel properly as it cooks down.
Lemon Juice
Fresh lemon juice adds brightness and tartness that balances the sweetness of this seedless blackberry jam and helps activate the natural pectin in the berries. It also acts as a natural preservative that extends the shelf life of this homemade seedless blackberry jam no pectin.
Tips and Tricks
Use a large, wide heavy-bottomed saucepan for this seedless blackberry jam so the mixture cooks evenly and the liquid evaporates faster. A wider pan significantly speeds up the cooking and thickening time.
Press the cooked berries through the strainer using the back of a spoon in circular motions. Don’t rush this step — working slowly gets more pulp and juice through the strainer and gives you a better yield of smooth jam from this easy three ingredient blackberry jam recipe.
Do the cold plate test before jarring to make sure the jam is properly set. Drop a small spoonful onto a plate that’s been in the freezer for a few minutes and push it with your finger — if it wrinkles, this seedless blackberry jam is ready.
Pro Tips
Add a teaspoon of vanilla extract to this seedless blackberry jam right before jarring for a warm, aromatic note that pairs beautifully with the blackberry flavor without overpowering it.
If the strained jam looks too thin after returning it to the saucepan, cook it in 5-minute increments until it reaches the right consistency. Every batch of berries has different moisture levels so cooking time can vary for this homemade seedless blackberry jam no pectin.
For an even silkier texture, use an immersion blender to puree the cooked berries before straining instead of just mashing them. This pushes more pulp through the strainer and maximizes the yield of this easy three ingredient blackberry jam recipe.
Step-by-Step Instructions
- Wash the blackberries and add them to a wide, heavy-bottomed saucepan over medium heat.
- Mash the berries with a potato masher as they heat up until they break down completely into a chunky puree.
- Add the sugar and lemon juice and stir until the sugar dissolves.
- Bring the mixture to a boil over medium-high heat, stirring frequently.
- Reduce to a steady simmer and cook for 15-18 minutes, stirring often, until the berries are completely soft and broken down.
- Remove from heat and press the cooked berry mixture through a fine mesh strainer using the back of a spoon, collecting the smooth seedless puree in a bowl below. Discard the seeds and solids left in the strainer.
- Return the smooth puree to the saucepan over medium heat and cook for another 8-12 minutes, stirring frequently, until the jam thickens to a glossy, spreadable consistency.
- Do the cold plate test — drop a small spoonful onto a frozen plate and push it with your finger. If it wrinkles, the seedless blackberry jam is ready.
- Skim off any foam from the surface.
- Pour the hot jam into clean jars, leaving ¼ inch of space at the top.
- Let cool completely at room temperature, then seal and refrigerate.
Variations
For a blackberry vanilla jam, stir a teaspoon of pure vanilla extract into this seedless blackberry jam right before pouring into jars for a warm, aromatic version.
Add a pinch of cinnamon and a tiny pinch of cardamom while the jam cooks for a spiced winter-inspired version of this homemade seedless blackberry jam no pectin.
For a mixed berry seedless jam, replace half the blackberries with raspberries or blueberries while using the same straining method for a beautiful mixed fruit version.
Add a tablespoon of balsamic vinegar to the saucepan while the jam cooks for a sophisticated, slightly tangy depth that pairs wonderfully with cheese boards.
For a lower sugar version, reduce the sugar by 25% and add an extra tablespoon of lemon juice to help with the set in this easy three ingredient blackberry jam recipe.
How to Store
Store this seedless blackberry jam in sealed jars in the refrigerator for up to 3 weeks. Since this is a refrigerator jam and not a water-bath canned product, it doesn’t have the long shelf life of commercially preserved jams.
To freeze, spoon cooled jam into freezer-safe containers leaving a little room for expansion. Frozen jam keeps for up to 6 months — thaw overnight in the fridge before using.
Always use a clean spoon when scooping from the jar to prevent introducing bacteria that can shorten the shelf life of this homemade seedless blackberry jam no pectin.
Frequently Asked Questions
Do I need pectin for this recipe?
No, the natural pectin already present in blackberries is enough to thicken this seedless blackberry jam without adding store-bought pectin — especially after straining and cooking the puree down properly.
Why is my jam not thickening?
It needs more cooking time. Return the strained puree to the saucepan and cook for another 5-10 minutes, then retest with the cold plate method for this easy three ingredient blackberry jam recipe.
Can I use frozen blackberries?
Yes, use them straight from frozen. Add 2-3 extra minutes of cooking time in the initial cooking stage before straining this seedless blackberry jam.
How do I know when the jam is set?
The cold plate test is the most reliable method — drop a small spoonful onto a frozen plate and push it with your finger. If it wrinkles and holds its shape, this homemade seedless blackberry jam no pectin is done.
How is this different from the small batch blackberry jam recipe?
The main difference is the straining step — this seedless blackberry jam removes all the seeds for a completely smooth texture, while the small batch version keeps the seeds for a more rustic, traditional jam texture.
Can I double this recipe?
Yes, but a larger batch takes longer to cook down and thicken. Use the largest, widest pan you have so the liquid evaporates efficiently in this easy three ingredient blackberry jam recipe.
Do I need to sterilize the jars?
Since this is a refrigerator jam, clean jars washed with hot soapy water are fine. Full water bath sterilization is only needed if you plan to shelf-store this seedless blackberry jam long-term.
Seedless Blackberry Jam
Ingredients
Equipment
Method
- Wash the blackberries and add them to a wide, heavy-bottomed saucepan over medium heat.
- Mash the berries with a potato masher as they heat up until they break down completely into a chunky puree.
- Add the sugar and lemon juice and stir until the sugar dissolves.
- Bring the mixture to a boil over medium-high heat, stirring frequently.
- Reduce to a steady simmer and cook for 15-18 minutes, stirring often, until the berries are completely soft and broken down.
- Remove from heat and press the cooked berry mixture through a fine mesh strainer using the back of a spoon, collecting the smooth seedless puree in a bowl below. Discard the seeds and solids left in the strainer.
- Return the smooth puree to the saucepan over medium heat and cook for another 8-12 minutes, stirring frequently, until the jam thickens to a glossy spreadable consistency.
- Do the cold plate test — drop a small spoonful onto a frozen plate and push it with your finger. If it wrinkles, the jam is ready.
- Skim off any foam from the surface.
- Pour the hot jam into clean jars, leaving ¼ inch of space at the top.
- Let cool completely at room temperature, then seal and refrigerate.