Sprinkle gelatin over water in a saucepan. Wait 1 minute then heat gently until gelatin melts. Meanwhile, combine undrained pineapple and ricotta in a food processor, using the steel blade. Process smooth. Add melted gelatin along with remaining ingredients; process smooth. Spoon into a 9 or 10 inch pie pan and chill until set. Cut into wedges to serve. (Garnish with fresh berries or other fruit if desired.) Makes 10 servings.