Preheat the oven to 350 degrees. Cut off the very top of the pineapple and discard. Place pineapple in a roasting pan. Roast the whole pineapple for about 1 hour, then remove from the oven and, as soon as it is cool enough to handle, cut it first into 8 thick rounds, crosswise. Cut these slices in half and arrange on a patter.