Oven 350 degrees
In suacepan, combine 1 1/2 cups sugar, the cornstarch, and salt. Blend in water.
Bring to boiling over medium heat and cook, stirring constantly, till thick, about 5 min.
Remove from heat; stir small amount of hot mixture into egg yolks, then return to remaining hot mixture in pan. Bring to a boil and cook 1 minute, stirring constantly. Remove from heat.
Add lemon peel and butter. Slowly stir in 1/3 cup lemon juice. Cool to lukewarm. Pour into cooled baked pastry shell.
Beat egg whites with 2 tsp lemon juice until soft peaks form. Gradually add 7 Tbls sugar, beating until stiff peaks form and sugar has dissolved.
Spread meringue over filling, sealing to edges of pastry to avoid shrinking. Bake in moderate oven (350 degrees) 12-15 minutes or until meringue is golden brown. Cool thoroughly before serving (if you can wait!! :) You will make this again and again!!! Enjoy!