Preheat your oven to 350°F (175°C).
In a bowl, whisk together sugar, cornstarch, and salt.
In another bowl, beat eggs and egg yolks until combined.
Add lemon juice and zest to the egg mixture, mixing well.
Gradually stir in the sugar mixture.
Pour in the melted butter and mix until smooth.
Pour the filling into the pre-made pie crust.
Bake for 30 minutes, or until the filling is set.
Remove from the oven and let it cool at room temperature.
Chill in the refrigerator for at least 2 hours before serving.