1/2 oz of Lemon Juice
1/2 tsp of superfine sugar (or sugar)
2 tsp of ruby port (or port)
1 1/2 oz of Tequila
Pour tequila, lemon juice, sugar and port into a cocktail shaker half-filled with ice cubes. Shake well, and pour into a highball glass almost filled with ice cubes. Garnish with a maraschino cherry, and serve.