Place the cheesecake pan into a large, deep pan. Fill the pan with 2 and ½- inches of hot water. This is your water bath and will help ensure your cheesecake comes out crack free.
Carefully place the pan in the oven and bake for 1 hour and 30 minutes. Turn the oven off and let the cheesecake sit, undisturbed, for 30 minutes, inside the oven with the door shut. The cheesecake should still be slightly wiggly.
Remove cake from the oven and gently run a knife very around the edge of the cake. Place the cheesecake on a cooling rack and cool completely, then loosely cover the pan with saran wrap and chill for at least 6 hours. Do not remove the pan until completely cooled!
For the Chocolate Ganache:
Chop the chocolate and place it in a heatproof bowl. Set aside.
Pour the cream into a small saucepan and bring to a boil over medium-high heat. Pour the hot cream over the chopped chocolate and set aside for 5 minutes. Then vigorously whisk the mixture until smooth and creamy. Whisk in the grand marnier. Allow chocolate to sit for 10 minutes, then pour on top of the chilled cheesecake. Let the chocolate set for 20 minutes, then decorate with candied orange slices, slice and serve.
Allow chocolate to sit for 10 minutes, then pour on top of the chilled cheesecake. Let the chocolate set for 20 minutes, then decorate with candied orange slices, slice and serve.
