method
1. Put the jam in a saucepan with 250 ml (8 fl oz) water and bring to the boil.
2. Add lemon juice to taste.
3. In a cup, mix the arrowroot with a little cold water until smooth.
4. Stir into the hot liquid and heat gently until the sauce thickens, stirring all the time.
5. Add a little colouring if necessary. Pour into a jug and serve at once.
serving amount
makes about 300 ml (1/2 pint)
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