The Spanish G&T is all about the garnish. The possibilities are endless, but the idea is to choose garnishes that complement both the gin and the tonic.
London Dry and other juniper-forward gin's pair well with Classic Tonic, fresh herbs, citrus, and juniper berries. American and other floral-forward gins take well to Indian Tonic and fresh seasonal fruits and edible flowers.
Spanish G&T Recipe:
2 oz gin
4 oz tonic*
2 dashes bitters, optional
Stir all ingredients together with ice in a wide-mouthed wine glass and garnish (*see above for recommendations).