PLACE COCONUT FLAKES IN A FOOD PROCESSOR AND PULSE UNTIL CHOPPED UP. SET ASIDE.
COMBINE FLOUR, SALT AND BAKING SODA IN A BOWL AND SET ASIDE.
CREAM THE BUTTER AND SUGAR TOGETHER, BEAT IN EGG, LEMON JUICE AND VANILLA UNTIL MIXED WELL. STIR IN THE FLOUR MIXTURE AND COCONUT, MIXING WELL TO INCORPORATE.
SHAPE DOUGH INTO TWO ( 2" DIAMETER ROLLS). WRAP AND CHILL 4 HOURS IN REFRIGERATER.
WITH A SHARP THIN KNIFE, SLICE DOUGH 1/4" THICK AND PLACE 1" APART ON A LIGHTLY GREASED BAKING SHEET. BAKE FOR APPROXIMATELY 10 TO 12 MINUTES OR UNTIL SLIGHTLY GOLDEN IN COLOR. REMOVE FROM OVEN AND ALLOW TO COOL SLIGHTLY. REMOVE TO A WIRE RACK AND COOL COMPLETELY.