Blackberry Jam (Pectin Method)
Blackberry jam is an easy way to preserve summer berries with a sweet and tart flavor for use later on. With the added pectin, this simple recipe is pretty much foolproof.
Servings: 8 jam jars (about)
Ingredients
- 8 cups blackberries
- 4 ½ cups granulated sugar separated
- 1 box (1.75 oz) Sure-Jell less sugar pectin (see notes)
- ½ tsp unsalted butter
- 1 tbsp fresh lemon juice
Instructions
- Prepare the blackberries: Crush the blackberries with a masher until they are mostly broken down. Measure out exactly 5 cups of the crushed fruit. In a small bowl, combine ¼ cup of sugar and the Sure-Jell.8 cups blackberries, 4 ½ cups granulated sugar, 1 box (1.75 oz) Sure-Jell less sugar pectin (see notes)
- Cook the blackberries: In a heavy-bottomed kettle, add the 5 cups crushed blackberries, Sure-Jell and sugar mixture, butter, and lemon juice. Heat the mixture while stirring to combine. Allow the mixture to come to a rolling boil, which is a boil that does not cease when stirring, 8-12 minutes. When the mixture is at a rolling boil, add the remaining 4 ¼ cups of sugar. Allow the mixture to return to a rolling boil and boil for exactly 1 minute. Then, remove from the heat.4 ½ cups granulated sugar, ½ tsp unsalted butter, 1 tbsp fresh lemon juice
- Fill the jars: Ladle the jam into sterilized jars, leaving ¼ inch of headspace. Clean the rim of each jar to ensure none of the jam interferes with the jar's sealing. Place a prepared lid and ring on each jar. Tighten to finger-tip tightness.
- Water bath the jars: Lower the jars into a prepared water bath canner fitted with a rack. Bring to a boil and boil for 10 minutes. Then, remove the jars from the canner and set them on a cooling rack. The jars should seal quickly. Allow to cool for 12 hours before checking the seals.
Have 4 ¼ cups of sugar measured out into a bowl so it's ready when it's time to add to the mixture in the following step.
Notes
Food safety tip – Home canning is safest when you follow research-tested recipes and proper processing times. Improper canning can risk botulism. New to canning? See my Canning 101 Guide and consult the USDA Complete Guide to Home Canning.
This recipe uses Sure-Jell for recipes with less sugar. This means that the Sure-Jell has been formulated specifically for use with recipes that require less sugar. If you want to use the original Sure-Jell, use 5 cups of crushed blackberries and 7 cups of granulated sugar rather than the amounts listed above. See Sure-Jell's recipe for specifics.
Nutrition
Serving: 1tbsp | Calories: 33kcal