Preheat a broiler. Cut each grapefruit in half crosswise. Cut a thin slice off the bottom of each half, if necessary, so that it will stand upright. Using a small, sharp knife, loosen the grapefruit segments in each half by first carefully cutting between the fruit and the peel and then by cutting along either side of each segment to free it from the membrane. Leave all the segments in their shells.
Place the halves upright in a baking dish. Using your fingers, sprinkle the sugar and cinnamon evenly over the grapefruit halves. Slip under the broiler about 4 inches from the heat source and broil until the sugar is uniformly bubbly, 3 to 5 minutes.
Transfer each grapefruit half to an individual dish and lightly sprinkle with salt. Serve immediately.
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