Heat griddle until super hot, (1.5 minutes should do the trick). Drizzle oil on griddle and brush to coat evenly. Cut grapefruit in half. Place grapefruit flesh-side down on griddle and weigh down with a cutting board or plate. Cook 4 minutes. I like to serve it as is, in the yellow bowl the grapefruit conveniently comes in, so I cut around the outside edges. (I serve with a grapefruit spoon). Drizzle with honey.