This quick blackberry jam (no pectin) is the easiest way to bottle summer. With fresh or frozen berries, sugar, lime, and a cornstarch slurry, you'll have a small jar of vibrant, spoonable jam in about 15 minutes-ideal for breakfast spreads, desserts, and gifting.
Table of Contents
🍇 Recipe Snapshot:
- Prep Time: 5 minutes
- Cook Time: 10 minutes
- Total Time: ~15 minutes
- Batch Size: 1 small jar
- Main Ingredients: Blackberries, sugar, lime, cornstarch
- Best For: Toast, yogurt, muffins, brunch boards
- Special Notes: No pectin needed - Works with fresh or frozen berries - Small-batch & freezer-friendly
What is a quick jam?
A quick jam is a simple, small-batch fruit preserve that:
- Uses fresh or frozen fruit 🫐
- Cooks briefly on the stovetop (about 10 minutes)
- Needs no added pectin
- Relies on fruit's natural juices, sugar, and a little cornstarch to thicken
- Has a soft, fresh fruit flavour compared to long-cooked jams
- Because it's cooked quickly, quick jam is best stored in the fridge for short-term use (or freezer for more extended storage).
👉 Quick Jam vs. Freezer Jam
- Quick jam → Lightly cooked, thickened naturally, stored in fridge/freezer.
- Freezer Jam → Usually uncooked, often mixed with sugar/pectin, stored in freezer only.
Why this recipe works
- Quick & Easy → Ready in about 15 minutes with just a handful of pantry ingredients: blackberries, sugar, lime, and cornstarch.
- No Pectin Needed → Blackberries are naturally high in pectin, so you get a good set without additives.
- No Fancy Equipment → A simple pot on the stovetop is all you need.
- Flexible → Adjust the sugar to taste, add citrus or spices for variation, and scale the batch up or down.
- Versatile → Perfect on toast, pancakes, muffins, or swirled into yogurt.
Related: See my banana jam for further inspiration.
Ingredients
- Blackberries - I've used fresh berries, but frozen blackberries work equally well. If you can get your hands on wild blackberries - even better!
- Sugar - I'm using white granulated sugar for today's recipe. However, you can use caster sugar (superfine) or brown sugar.
- Lime - The juice from the lime adds a subtle tangy flavour to the jam. It also helps bring out the natural flavour of the berries. Lime zest would also work well. You can also substitute with lemon juice.
- Water - This helps release the juices from the berries.
- Corn flour or corn starch is an excellent thickener for jams. It has an almost pudding-like texture when mixed with hot liquid.
Recipe variations
- Swap the liquid - use ½ cup white wine instead of water, or add a splash of Chambord.
- Sweeten differently - replace half the sugar with honey.
- Spice it up - add a cinnamon stick, ground cinnamon, or vanilla bean.
- Add fruit - stir in grated apple for natural pectin, or try chopped peaches or plums for tartness.
How to make blackberry jam
Cook The Fruit
Add blackberries, water, sugar, and lime juice to a pot or saucepan. Bring to a boil and cook ~10 minutes until softened and deep red. Skim off any foam.
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Mash
Use a fork or potato masher to break down the berries.
Thicken
Whisk cornstarch with a bit of water, then stir the slurry into the jam. Cook a few minutes more until thickened (watch for splatters).
Cool & Store
Remove from heat, let cool, then transfer to a sterilised jar.
🫐 Blackberry Jam at a Glance
Cook → Mash → Thicken → Cool
Expert tips
- Choose ripe berries: They release more juice and give the jam better flavour.
- Frozen works too: No need to thaw - just pop them straight into the pot.
- Use the right pot: A medium-large pot prevents splatters and helps the jam cook evenly.
- Sterilise jars: Run through the dishwasher or wash in hot, soapy water and dry thoroughly.
- Rest before jarring: Let the jam sit for ~10 minutes off the heat so flavours develop.
- Storage: Cool completely, seal with lids, and keep in the fridge (or freezer for longer).
Serving Suggestions
- Breakfast: Spread on toast, muffins, pancakes, or waffles.
- Snacks: Swirl through Greek yogurt or spoon over oatmeal.
- Desserts: Use as a filling for cakes, tarts, or cookies; drizzle over cheesecake or ice cream.
- Cheese boards: Pair with brie, goat cheese, or sharp cheddar.
- Gifting: Package homemade food gifts in small jars.
FAQ
Keep it in sterilised glass jars and store in the refrigerator. For longer storage, freeze in freezer-safe containers and thaw in the fridge before using.
It will thicken as it cools, but if it's still runny, add a little more cornstarch slurry and simmer briefly.
This recipe uses sugar for flavour and texture. Still, you can reduce the amount of sugar slightly or replace some with honey for a less-sweet version.
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📖 Recipe
Blackberry Jam (Without Pectin)
Video
Conversions
Ingredients
- 250 g blackberries, fresh or frozen; wild if available (See Note 1)
- 220 g sugar, white granulated; caster or brown sugar can also be used (See Note 2)
- 180 ml water, divided (120 ml for cooking + 60 ml for slurry)
- 1 lime, juiced (lemon is a fine substitute; zest optional) (See Note 3)
- 15 g cornstarch, cornflour (See Note 4)
Instructions
- Combine the blackberries, 120 ml (½ cup) of the water, sugar, and lime juice in a medium-large pot over medium heat.250 g blackberries fresh or frozen; wild if available (See Note 1), 220 g sugar white granulated; caster or brown sugar can also be used (See Note 2), 180 ml water divided (120 ml for cooking + 60 ml for slurry), 1 lime juiced (lemon is a fine substitute; zest optional) (See Note 3)
- Bring the mixture to a boil and cook for about 10 minutes, until the berries have softened and the mixture turns a deep red. Skim off any foam that rises to the surface. (See Note 5)
- Mash the softened berries thoroughly with a fork or potato masher.
- In a small bowl, whisk the cornstarch with the remaining 60 ml (¼ cup) water to make a slurry. Stir the slurry into the berry mixture and mix vigorously. (See Note 4)15 g cornstarch cornflour (See Note 4)
- Increase the heat to high and cook for 2-3 minutes, stirring constantly (be careful of splatters!) until the jam thickens. (See Note 6)
- Remove from the heat and let the jam sit for about 10 minutes. This allows the flavours to mingle and the jam to begin setting. (See Note 7)
- Cool completely before transferring to sterilised jars. Seal with lids and refrigerate. (See Notes 8 & 9)
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Peter's Tips →
- Swap water for white wine or add a splash of Chambord.
- Replace half the sugar with honey.
- Infuse with cinnamon stick, ground cinnamon, or vanilla bean.
- Add grated apple for natural pectin, or chopped peaches/plums for tartness.
- Note 1 (Blackberries): Fresh, ripe berries release more juice and flavour; frozen work straight from the freezer.
- Note 2 (Sugar): White sugar keeps flavour clean; caster dissolves faster; brown sugar adds caramel notes.
- Note 3 (Citrus): Lime juice/zest brightens the jam; lemon is a good substitute.
- Note 4 (Cornstarch): Always whisk with cold water first to prevent lumps; thickens quickly for a silky texture.
- Note 5 (Foam): Skimming foam while boiling improves appearance and texture.
- Note 6 (Pot size): A medium-large pot helps avoid splatters and ensures even cooking.
- Note 7 (Resting): Letting the jam sit 10 minutes off heat allows flavours to develop and begin setting.
- Note 8 (Jars): Sterilise in the dishwasher or with hot soapy water; dry thoroughly before use.
- Note 9 (Storage): Store in fridge up to 2 weeks, or freeze for longer storage.
Nutrition
This website provides approximate nutrition information for convenience and as a courtesy only. Nutrition data is gathered primarily from the USDA Food Composition Database, whenever available, or otherwise other online calculators.
© Souvlaki For the Soul
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Rate and Comment below!This post was first published in January 2009 but was republished with new content and pictures in January 2022.
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