Beautiful blackberry jam

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• Easy

• Serves: 80
• Ready in: 30 mins (10 mins Prep - 20 mins Cook)

Ingredients

• 1.75kg blackberries
• 2kg caster sugar
• 6 teaspoons powdered pectin
• 1 tablespoon unsalted butter

Preparation method

1.   Place the blackberries into a large, heavy saucepan and crush them with a potato masher.
2.   Add the sugar and pectin and heat very slowly, stirring all the time until every grain of sugar has dissolved. Add the butter, increase the heat, bring to a full rolling boil and boil for exactly 4 minutes. Remove from the heat, cool for 1 minute, then place in jam jars and cover immediately.