I had forgotton about this drink and recently started making it again...this is such a satisfying, easy drink to make, and particularly good for hot days - the *hardest* part is remembering to have the simple syrup on hand. Try it...
In your shaker, blend 2 parts lemon juice (please make it freshly squeezed - the stuff in the plastic lemon really doesn't count), 1 part whiskey, 1 part simple syrup (50/50 sugar\water, heated in a sauce pan until the sugar has completely dissolved; make 4 or 5 cups at a time and store in the fridge...). Pour over ice, sit back and enjoy.