This quick microwave recipe is best made in small batches. It will keep in the fridge for up to two weeks. Spread it on hot buttered toast, or use it to fill the mini lemon meringue pies. If you don't have a microwave, use a heatproof bowl set over a pan of simmering water, and cook for 8-10 minutes until the mixture coats the back of a spoon.
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