Now for the magic trick that makes you look like a kitchen wizard: supremed segments. Hold the peeled grapefruit in your non-dominant hand, and with the knife, cut alongside each membrane line, not through it.
Slide the blade gently between the flesh and the white wall. Pop each segment out whole, like a jewel from its setting. No pith, no seeds, no bitterness. Just pure, geometric perfection.
Don’t worry if you mess up the first few. Practice is the condiment of mastery. You’ll get faster, and your fingers will remember the rhythm.