Grapefruit Rock And Rye is revitalizing very strong cocktail at 1.3 standard drinks. Shaken with 30ml grapefruit liqueur dekuyper and 30ml whisky rye with 100ml ice and best with lunch. Just place candied grapefruit into shaker then add half the ice to shaker and add all ingredients to shaker. Shake well and pour everything into glass and top glass with ice and served in a old fashioned glass cold.