Barcelona Fizz Cocktail

11/2 oz Sweet Sherry
1 oz Gin
1/2 oz Lemon Juice
1/4 oz Sugar Syrup
4 oz Soda Water
Ice Cubes

Shake all ingredients with ice, except soda water. Strain into a highball glass filled with ice. 

Complete with soda water and garnish with a lemon slice, a straw and a stirrer. Serve.