- Separate eggs, beat the egg yolks. Whisk in lemon rind, sweetened condensed milk and lemon juice. Pour into prepared crust.
- Bake in preheated 325°F oven for 25 minutes. Remove from oven. Increase oven temperature to 350°F.
- Beat egg whites with cream of tartar until foamy; gradually add sugar beating until stiff peaks form but not dry. Spread meringue on top of hot pie, sealing carefully to edge of crust.
- Return to oven and bake for 10 minutes or until meringue is golden brown. Cool. Chill before serving, if desired.