There are times when all the heavy holiday food can leave you craving something light and fresh. For times like these I present to you... The Citrus Sparkler Cocktail! It's so refreshing. First, slice lemon and grapefruit pieces. Fill a glass with ice, lemons and grapefruit pieces. Combine one part Gin, one part sweetened lime juice, a splash of citrus bitters and two parts club soda. Stir and serve!