MELT BUTTER IN A 10" PIE PLATE IN MICROWAVE.
CRUSH GRAHAM CRACKERS IN A ZIPLOC BAG, ADD TO MELTED BUTTER.
PRESS BUTTERED CRUMBS INTO PIE PLATE WITH THE BACK OF A SPOON, GENTLY PRESS DOWN AND SMOOTH OVER TO CREATE CRUST.
FREEZE CRUST FOR 10 MINUTES WHILE YOU MAKE THE FILLING.
WHIP CREAM IN A STAND MIXER OR BOWL WITH HAND MIXER UNTIL STIFF WITH PEAKS FORMING.
GENTLY FOLD IN CONDENSED MILK, LEMON JUICE, AND GRATED RIND.
POUR FILLING INTO PIE CRUST AND FREEZE UNTIL SET, ABOUT 4 HOURS OR OVERNIGHT.
DEFROST FOR 5-10 MINUTES BEFORE SLICING AND SERVING. SLICE INTO 8 PIECES.