I love grapefruit. The red ones I have right now are so delicious I am eating two a day.
To be very Martha-like I supreme them. It is quick and easy once you learn how.
First you slice off both ends. Use a medium sized knife that is somewhat pliable.
With it sitting flat on a cut end start at the top and slice to the bottom following the curve of the fruit to remove all the peel. Your mouth is watering right now isn't it?
Cup the fruit in your hand and carefully slice down along side the membrane in between a segment to the center.
Tilt the knife and now slice upwards on the side of the next membrane to free the slice of fruit.
Down one side and up the other.
Do this over a bowl to catch all the juice.
Once you have worked up a sweat doing this you can use the juice that you collected to make the Double Grape Cocktail posted below. Waste nothing.