Preheat your oven to 375°F and prepare the pie crust dough by mixing flour, sugar, salt, and cold butter until crumbly before adding ice water to form a dough.
Roll the dough into a circle and place it into a pie dish, trimming excess edges and pricking the bottom before baking for about 10–12 minutes until lightly golden.
Whisk together sugar and eggs until smooth, then add lemon juice, lemon zest, melted butter, flour, and salt until the filling becomes fully combined.
Pour the lemon mixture carefully into the pre-baked crust and spread evenly so the filling cooks consistently.
Bake the pie for about 22–25 minutes until the filling is mostly set but still slightly soft in the center.
Allow the pie to cool at room temperature before chilling it in the refrigerator for at least two hours to set properly before slicing.