Turn your oven's broiler on HI

Cut the grapefruit in half - try not to drool

Use a grapefruit spoon, or paring knife, to gently loosen the fruit from the skin (don't completely remove it all the way down to the base, you don't want to lose all the juice) - this allows all the yummy flavors to seep all the way down into the grapefruit.

Drizzle with honey, sprinkle with brown sugar and cinnamon.

Place under the broiler and (depending on your oven) cook for 3 to 10 minutes, or until the sugars are caramelized and the fruit is swollen and ready to burst out of the skin.