Ingredients

• 1kg blackberries
• 800g jam sugar
• 1 lemon, juiced

Method

1. 1

   Warm berries gently to release juices.

2. 2

   Add sugar and lemon; stir until dissolved.

3. 3

   Boil hard until setting point (105°C).

4. 4

   Skim, then pour into sterilised jars.

5. 5

   Seal and cool.