Rather than “peeling," it is best to cut away the peel of a grapefruit, to remove the bitter pith and membrane. Using a sharp kitchen knife, slice off the top and bottom of the grapefruit, then carefully cut a manageable section around the grapefruit peel, cutting from top to base following the grapefruit’s natural curve. Remove as much pith (the white part) as possible without taking too much fruit. Continue in this manner around the whole of the grapefruit until all the peel and pith has been removed. Any pith or membrane remaining should be carefully trimmed off. Once the peel is removed, cut into segments following the natural lines, trying your best to cut inside the membranes to remove each segment; repeat all the way around the grapefruit to retrieve all segments.