Whisk sugar, cornstarch, and salt together in a large, nonreactive saucepan.
Add egg yolks, then immediately but gradually whisk in 1 1/2 cups water.
Bring mixture to a simmer over medium heat, whisking regularly, , until thickened.
Remove from heat, whisk in zest, then juice, and finally butter.
Pour into prepared pie crust or refrigerate for other uses.
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