Cloister is savoureux robust cocktail at 1.9 standard drinks. Shaken with 45ml gin method and madness and 15ml chartreuse liqueur yellow with 10ml lemon juice as well as 10ml sugar syrup including 20ml grapefruit juice also 100ml ice and best with lunch. Just place ice into shaker then add all ingredients to shaker and shake well. Strain into glass and garnish with peel and served in a saucer glass cold.