Fill a cocktail mixing glass half full of clean iceRinse ice from a freezer dispenser with clean water before using. and place several cubes in a Nick and Nora glass to chill the vessel.
Add the gin, vermouth, and bitters to the mixing glass and stir with a cocktail spoon five times in one direction then five more in the opposite direction. Allow the drink to rest while you cut the twist.
Using a Y-style peeler, remove a 2-inch-long strip of peel from the lemon. I tend to peel longitudinally and while holding the peeler at a slight angle which tends to produce a strip with less of the bitter white or “pith.”
Dump the ice from the glass. (There is no such thing as a martini on the rocks, nor should there be.) Lightly run the peel around the rim of the glass, then give it a twist to release its oils and drop into the glass. Finally, strain the martini into the glass and serve immediately.