Ingredients:
- 4 cups (600g) fresh blackberries
- 2 tbsp (30ml) fresh lemon juice
- 1 pkg (1.75 oz / 50g) low-sugar pectin
- 2 cups (400g) granulated cane sugar
Instructions:
- Place the rinsed blackberries in a heavy-bottomed pot.
- Use a potato masher to crush the berries until you reach your preferred consistency.
- Stir in the lemon juice to stabilize the color and prep the pectin.
- Whisk the low-sugar pectin into the mashed fruit over medium heat.
- Increase heat to high and bring the mixture to a full rolling boil, stirring constantly to prevent the bottom from sticking.
- Gradually stir in the granulated cane sugar and return the mixture to a rolling boil.
- Continue boiling hard for exactly 1 minute, then remove from heat immediately.
- Skim off any foam from the surface with a spoon for a clear finish.
- Ladle the hot jam into sterilized jars, leaving 1/4 inch (6mm) of headspace.
- Wipe the rims clean, apply lids, and tighten rings to fingertip tight.
- Process in a boiling water bath for 10 minutes.