Prepare your glass: run a lemon wedge around the rim of a small cocktail glass, then dip it into pulverized white sugar to create an even sugar crust.
Cut a long spiral of lemon or orange peel and line the inside of the sugar-rimmed glass, draping it over the edge. Set aside.
Combine the brandy, maraschino liqueur, curaçao, fresh lemon juice, simple syrup, and aromatic bitters in a mixing glass.
Add ice cubes and stir well until thoroughly chilled, approximately 20–25 seconds.
Strain carefully into the prepared sugar-rimmed glass.
Garnish with a citrus slice on the rim if desired. Serve immediately.
The Brandy Crusta is credited to New Orleans bartender Joseph Santini circa 1850 and is considered a direct ancestor of the Sidecar and the entire sour family. The defining hallmarks are the sugar-crusted rim and the continuous spiral of citrus peel lining the glass - do not skip this preparation, as it is the soul of the drink.
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