Instructions: 1 Put the blueberries, caster sugar, lemon juice, 1 sprig of mint and 4 tbsp water into a saucepan. Boil, stirring until the sugar has dissolved.

2 Simmer the mixture gently for about 10 minutes. Then taste and adjust the sweetness as desired, adding more lemon juice if too bland.

3 Remove the sprig of mint. Chop or shred the leaves of the remaining mint sprig, stir into the sauce and serve warm or cold.

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