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In a medium saucepan, combine sugar, cornstarch, and salt. Gradually stir in milk.
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Cook over medium heat until mixture boils and thickens, stirring constantly.
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Boil one minute.
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In small bowl, blend about 1/3 of hot mixture into egg yolks.
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Return yolk mixture to hot mixture; blend well.
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Cook until mixture bubbles, stirring constantly.
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Remove from heat; add butter and vanilla.
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Cool slightly before serving.
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Store in refrigerator.