Ingredients:
- 6 cups (900g) fresh or frozen blackberries
- 2 tbsp (30ml) fresh lemon juice
- 3 cups (600g) granulated sugar
Instructions:
- Place the blackberries in a saucepan over medium heat for 5 minutes until they break down. Press the warm berries through a fine mesh sieve into a clean pot, discarding the seeds.
- Stir in the sugar and lemon juice. Bring the mixture to a rolling boil over medium-high heat, stirring constantly to ensure the sugar dissolves and the jam does not stick.
- Reduce heat to medium and simmer. Use a digital candy thermometer to track the temperature; the jam is ready when it reaches 220°F (104°C) and the bubbles become large and slow-popping.
- Perform the plate test: place a small dollop of jam on a chilled ceramic plate. Let it sit for 30 seconds, then push it with your finger. If the surface wrinkles, the jam has reached the perfect set.