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Simple three ingredient blackberry jam. This easy small batch recipe makes just 2 jars.
4.82 from 37 votes

Small Batch Blackberry Jam

Very quick, easy and delicious blackberry jam with just three ingredients. Small batch recipe which makes two jars.  Ideal for the beginner jam maker or preserver. Vegan
Servings: 30 portions
Prep Time10 mins
Cook Time20 mins
Total Time30 mins


  • 450 g blackberries
  • 450 sugar
  • 2 tbsp lemon juice - (about a whole lemon)


  • Wash the blackberries discarding any which are damaged and place in a saucepan.  Add the sugar and lemon juice and stir.
  • Leave for an hour to allow the sugar to draw the juice from the fruit.  Then heat gently to dissolve the sugar.
  • Once all the sugar is dissolved, quickly bring the temperature up to boiling to set the jam. Test with either a thermometer for a setting temperature of 105C, or another method as detailed in this post.
  • Spoon into sterlized, heated jam jars, seal with lids and allow to cool.


  • This recipe is 3 Weight Watchers Smart Points for one portion
  • Use the best quality fruit, discarding any over ripe or damaged berries.
  • Wild blackberries have more pectin than farmed. If your berries are especially tart - but still ripe - you can use less lemon juice.
  • 450g of blackberries will fill 2 x 250ml jars or will make just over 2 cups.
  • 450g of wild blackberries is approximately a litre or a generous 4 cups.
• Please note that the nutrition information provided below is approximate and meant as a guideline only.
• Unless stated otherwise cup conversions have been made with an online tool. For accuracy please check with your favoured conversion tool. We recommend buying inexpensive digital kitchen scales.
Calories: 47kcal | Carbohydrates: 12g | Potassium: 17mg | Sugar: 11g | Vitamin A: 25IU | Vitamin C: 2.6mg | Calcium: 3mg | Iron: 0.1mg