For the Rim:
Lemon
Sugar.

2 oz Vodka
2 oz Cointreau
1 oz Lemon juice
1/2 oz Simple syrup.

Boxcutters, Teaspoons, Jigger, Shaker Classic/Boston, Citrus Juicer, Strainer, Saucers, Large Martini Glass.

Pour a small amount of sugar into a shallow bowl. Run the edge of a cut lemon across a Martini Glass to wet it and then dip the edges into the sugar. Chill for a few minutes to set. Add the vodka, orange liqueur, lemon juice and simple syrup to a cocktail shaker. Fill with ice and shake well. Pour into the prepared glass and garnish with a wedge of lemon, if desired.