Place a rocks glass in the freezer 15-30 minutes before making the cocktail.
When ready, clean the skin of an lemon. Then, use a y-peeler, cheese slicer, or even a knife to create a roughly 1in x 2in (2.5cm x 5cm) long strip of lemon peel. Clean up the edges with a knife and gently cut away any pith that may be attached to the underside of peel. Set your garnish aside.
Next, cut, squeeze, and measure the lemon juice. Strain the juice directly into the cocktail mixing glass with a fine mesh strainer, to get rid of the pulp. (This is an optional step for us neurotics.) and set it aside.
Remove the chilled rocks glass from the freezer. To it, add a single, extra large ice cube. Set the glass aside for the ice to temper while you build the cocktail.
Measure and pour the other ingredients into the mixing glass. Add a few medium ice cubes and stir with a bar spoon for 30-45 seconds, to chill and slightly dilute the cocktail. Strain the cocktail into the prepped rocks glass with a Hawthorne strainer.
Express your prepared lemon peel over the drink by holding the top and bottom of peel horizontally and facing out. Squeeze down to release the oils. Rub the outside of the peel against the rim of the glass and slip it into the drink.
Sip and enjoy!