4 tsp cornflour (cornstarch)
4 tbsp caster (superfine) sugar
175ml/6fl oz/⅔ cup water
250g/9oz/2 cups blueberries
1 Put the cornflour and sugar in a pan and gradually mix in the water. Add the blueberries and bring to the boil.
2 Simmer gently over a low heat for 3–4 minutes, stirring, until the blueberries start to soften and the sauce is a deep colour. Serve warm or cold.