The intense heat of the broiler gives the grapefruit half a caramelized crust, so you get a sweet-smoky flavor in every bite of fruit. It makes the perfect contrast to the tartness of the grapefruit.
Just a few minutes cut-side up under the broiler should do it. Take the grapefruit out as soon as the top starts to get brown and bubbly. A little brown sugar sprinkled on top before broiling makes it even better!
Besides scooping it straight from the source, we like squeezing the broiled grapefruit to make juice (also an excellent cocktail mixer!). Any leftover fruit can go into salads later in the day or get saved for an afternoon snack.
Give it a try!