Combine the honey and 3T grapefruit juice in a small saucepan

Heat over low temperature until honey is smooth and mixture is warm throughout

In a mixing cup, add the ice, remaining grapefruit juice, 1/2 tsp. finely chopped rosemary and one sprig of fresh rosemary

Add in the warm simple syrup made from grapefruit juice and honey

Place lid on tightly and shake 30 seconds or until chilled

Pour into fancy glasses, add fresh sprigs of rosemary and add sliced mini grapefruits to the side of cups