Preheat oven to 325 degrees F. Stir together first 3 ingredients; press evenly into bottom and up sides of a 9-in pie dish.
Whisk together condensed milk, lemon rind, lemon juice and eggs until blended. Pour mixture into crust.
Beat egg whites and cream of tartar at high speed with an electric mixer until soft peaks form. Add sugar, 1 Tbsp. at a time; beat 2 to 4 minutes or until stiff peaks form and sugar dissolves. Spread meringue evenly over pie, sealing edges.
Bake for 15 to 20 minutes or until golden. Cool pie completely on a wire rack. Chill 2 to 4 hours or until firm before serving.