NOTE: To make beautiful, juicy little grapefruit segments with no pith or skin, set the peeled grapefruit on a cutting board and use a thin, sharp knife to cut down the sides of the fruit, just through the remaining pith and membranes, to reveal the flesh underneath. Then, remove each segment of grapefruit by cutting along the sides of the segments to release from the membranes, removing the seeds as you go.