Combine sugar, flour, salt, lemon rind, water, lemon juice and crushed pineapple. Blend well.
Blend: Blend a little of the hot mixture into three slightly beaten egg yolks. Add to hot mixture in sauce pan and cook for 2 minutes longer - stirring constantly
Stir in butter cover and cool.
Pour into pie shell and top with meringue.
For the meringue: In large bowl, beat egg whites and cream of tartar with electric mixer until foamy. Gradually add sugar, beating until mixture forms stiff peaks.