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I'm just a girl trying to keep up with a husband & a son
In a saucepan, stir together the sugar, cornstarch, salt and water. Cook on medium heat until the mixture comes to a boil and bubbles, stirring often. Cook for 3 more minutes, stirring continuously. Turn the heat off.
Whisk the yolks in a separate bowl. Whisk in 1/2 cup of the hot mixture bit by bit, then whisk the yolk mixture into the saucepan. Let the filling return to a gentle boil and cook for 3 more minutes, stirring continuously. Turn off the heat. Add the lemon zest, lemon juice and the butter. Stir until it is smooth and let cool slightly.
Pour the lemon mixture into a baked pie or tart shell and top with meringue.