Grease the sides and bottom of a 12" pan and keep aside. In a bowl, crush the digestive biscuits with a rolling pin and add the soft butter. Mix the crushed biscuits and butter with your fingers such that the mixture resembles coarse sand. Place this mixture in the base and sides of the greased tart pan and press with your fingers to about 1/3" thickness. Chill the biscuit base for an hour. While the base is chilling in the fridge, prepare the cheese cake mixture. In a small bowl, add the gelatin along with 3 tbsps cold water. Keep aside for a few minutes to allow it to bloom (the gelatin absorbs the water). Place the bowl over very low flame and stir till the gelatin dissolves. It should not boil. Turn off heat and cool. Keep aside. To prepare the cheesecake, place the cream cheese, sugar and vanilla essence in a large bowl. Using an electric mixer, beat together till it forms a smooth mixture. Add the gelatin mixture and mix well till incorporated. In a separate bowl, whip the whipping cream till peaks form and fold it into the cream cheese mixture.Remove the tart pan from the fridge and pour the prepared cheesecake mixture over the biscuit base. Use a spatula to smooth out the top. Cover will a cling film or plastic wrap and place in freezer for at least two hours. Now prepare the ganache. Pour the cream into a stainless steel vessel and place over low heat. When bubbles appear along the edges, turn off heat. Add the grated chocolate and mix. Place lid and keep aside for 3 mts. After 3 mts, use a wooden spoon to stir in one direction such that the cream and chocolate blend together to form a smooth mixture and no trace of chocolate chunks are left. The chocolate should melt completely. Allow to cool for 15 mts at room temperature. Remove the tart pan from fridge after two hours and pour the room temperature ganache over the set cheesecake. Cover with plastic wrap again. Set in fridge for at least 6 to 8 hours or overnight. Remove the tart pan from the fridge and place on a warm kitchen towel for 3 to 4 mts. This will help to slowly loosen the base of the tart pan. Carefully lift the base of the pan and place the chocolate cheesecake on a serving plate. Cut into wedges and serve.

Servings:  8
Prep Time:  30 min
Total Time:  30 min