Directions:
- In a medium saucepan, combine sugar, cornstarch, flour and salt. Gradually stir in water.
- Cook and stir over medium heat until thickened and bubbly.
- Reduce heat; cook and stir for 2 minutes more.
- Remove from the heat.
- Gradually stir 1 cup of hot mixture into egg yolks; return all to saucepan.
- Bring to a boil.
- Cook and stir for 2 minutes.
- Remove from the heat.
- Stir in the butter, lemon juice, and zest until smooth.
- Pour into pastry shell. In a bowl, beat egg whites and salt until stiff but not dry peaks are formed.
- Gradually beat in sugar until soft peaks form.
- Spread over pie, sealing edges to pastry.
- Bake at 350° for 12-15 minutes or until meringue is golden.
- Cool.
- Store any leftovers in the refrigerator.