Combine 1¼ c. sugar, flour and salt. Cream butter until soft and blend with sugar mixture.
Add 3 well-beaten eggs, reserving 1 tsp. egg white for topping.
Grate lemon peel; then peel lemon, discarding white membrane. Cut lemon in paper-thin slices (should be ⅓ c.). Add lemon peel and slices and water to sugar mixture. Pour into pastry-lined 8" pie pan.<