Lemon Sauce For Sweet Puddings
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Ingredients
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The rind and juice of 1 lemon, 1 tablespoonful of flour, 1 oz. of butter, 1 large wineglassful of sherry, 1 wineglassful of water, sugar to taste, the yolks of 4 eggs.

Method
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Rub the rind of the lemon on to some lumps of sugar; squeeze out the juice, and strain it; put the butter and flour into a saucepan, stir them over the fire, and when of a pale brown, add the wine, water, and strained lemon-juice. Crush the lumps of sugar that were rubbed on the lemon; stir these into the sauce, which should be very sweet. When these ingredients are well mixed, and the sugar is melted, put in the beaten yolks of 4 eggs; keep stirring the sauce until it thickens, when serve. Do not, on any account, allow it to boil, or it will curdle, and be entirely spoiled.

Source: Mrs Beeton's Book of Household Management (1861)
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