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Sift together into top of a double boiler the sugar, cornstarch and salt.
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Add 2 cups boiling water stirring well. Stirring gently and consistently, bring mixture rapidly to boiling over direct heat and cook for 3 minute
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Place top portion over simmering water in bottom half. Cover and cook for 12 min, stirring three or four times.
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Slightly beat the egg yolk then, while stirring vigorously, add 3 tbsp of the hot mixture to the yolk. Immediately blend into the double boiler mixture.
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Cook over simmering water 3 to 5 min, stirring slowly to keep mixture cooking evenly.
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Remove from heat and blend in butter, vanilla extract and nutmeg.
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Serve hot.