Gin Rickey (Alcoholic Cocktail Highball glass)

Fill a tall glass halfway with ice. Mix the gin and grenadine and pour over the ice. Add the lime or lemon juice and top off with sparkling water. Decorate the glass with lime and/or lemon slices.

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2 ounces of gin
1 teaspoon grenadine
Juice of 1/2 lemon
Recharge with sparkling water
Garnish lime