Wrap the outside of cooled pan in foil so that no water will get into pan during baking. Place cake pan in a roasting pan. Pour batter into cake pan. Using a spatula, go over the top of the batter to get rid of any air bubbles. Place roasting pan in middle rack of heated oven. Put very hot or boiling water in a measuring cup. Pour water into the side of roasting pan carefully so no water splashes into cake pan. Water should come halfway up the sides of cake pan. Bake in middle rack of oven for 1 hour 30 minutes. Cake will puff up a bit and jiggle slightly in the center. Remove cake pan from roasting pan and place on a rack to cool. When completely cool, remove foil. Cover cake. Chill for at least 8 hours. Chilling for 24 hours is best. Unlatch and remove side of pan by lifting up. Slice cake with a knife dipped in hot water and wiped between cutting each slice. Serve small slices as this is a rich, creamy, dense and filling cake.