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6
Easy
Heat the butter in a saucepan, add the flour and cook, stirring with a wooden spoon, for 1 or 2 minutes without letting the mixture take on any colour. Add the milk, and sugar, and cook, stirring, for 3 or 4 minutes longer. Stir in the lime juice and rind, and mix well. Allow to cool for a few minutes then beat in the egg yolks, one by one. Beat the egg whites with the salt until they stand in