No need to worry about meringues for this lemon wonder. This is a lemon creamsicle in a pie.
You could do a chocolate or caramel version by alternating the fillings; crusts and topping but procedures are the same. I would serve this with raspberry puree to add a splash of color and more summer tartness. Ice Box Pies are no sweat in work or worry over meringue! Citric acid or sour salts or tartartic acid is available through mail order or often, in kosher food sections, or at the pharmacy. It provides an added boost of tartness which is very appealing. If you don't have it, this is still an exceptional summer pie.