In a small bowl, mix cornstarch and salt. Pour mixture into cold water, mix well, and set aside. Pour the hot water into a pot and add 1¼ cups of sugar. Bring to boil, add cornstarch mixture, and cook until thick. Stir occasionally to mix.
Once it reaches desired consistency, remove from heat. Pour some of the hot lemon mixture into the egg yolks (to temper) and then pour yolks into the pot. Mix well. Add lemon juice and stir. Add the lemon zest and margarine and mix well. Allow mixture to cool.
Pour lemon mixture into pie crust and bake at 325°F (160°C) for 25–30 minutes. Let it cool completely so it can set properly.
In a medium bowl, beat egg whites. When soft peaks form, add 6 Tbsp sugar and a drop of lemon juice and beat until meringue is fluffy. Using a piping bag, pipe the meringue onto the base, sealing it to the crust.
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