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A small jar of jam, tied with a string bow on a lace table cloth, and 2 berries in front of it.
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4.41 from 5 votes

Simple, Small Batch Black & Blueberry Jam

This tasty blue and blackberry jam is so nice to serve with homemade pastries or even to give as a thoughtful present!
Prep Time5 mins
Cook Time10 mins
Cooling Time1 hr
Total Time15 mins
Course: Spread
Cuisine: International
Servings: 10 Servings
Calories: 108kcal


  • 1 cup mixed blueberries & blackberries
  • cup granulated sugar
  • 1 tbsp. lemon juice
  • 2 tsp. cornstarch


  • Add your berries and lemon juice to an enamel or stainless steel sauce pan and cook them over a medium flame. 
  • Just as you begin cooking, mash them with your potato masher, making sure to leave some berries chunkily mashed. Allow to cook for about 3 minutes until bubbling.
  • Add the sugar, stir and increase to a high flame. Bring to a bubbling boil. Once the berries are boiling, reduce to a medium simmer for about 5 minutes. Continue to stir.
  • If the jam still appears to be very liquidy after that 5 minutes of simmering and stirring, add cornstarch. The sourness of your berries will be a factor in the consistency of your jam. If they’re sour, it may not require cornstarch, if they’re sweet, they may require up to 2 tsp. If you’ve added cornstarch, give it a nice stir and let it cook for another two minutes on a simmer. Once the consistency is a syrupy thickness, it’s done.
  • Remove from heat and allow to cool in a container to room temperature. Then cover and refrigerate. 


Serving: 2tbsp. | Calories: 108kcal | Carbohydrates: 27g | Potassium: 8mg | Sugar: 26g | Vitamin A: 5IU | Vitamin C: 1mg | Calcium: 1mg