Chocolate Orange Marble Cheesecake - cooking recipe

Ingredients

24 ounces cream cheese, softened
3/4 cup light brown sugar, firmly packed
1/4 cup granulated sugar
4 eggs
4 cups sour cream
1 tablespoon orange rind, grated
6 ounces squares semisweet chocolate, melted and cooled
Crust
1/2 cup graham cracker crumbs
1 tablespoon granulated sugar
2 tablespoons butter or 2 tablespoons margarine, melted
1 ounce unsweetened chocolate square, melted
orange slice (optional)
chocolate leaves (optional)

Preparation

Preheat oven to 350F and lightly butter 8\" x 3\" deep springform pan.
Combine crumbs, sugar, butter and chocolate in a small bowl.
Press into bottom of prepared springform pan; refrigerate.
Beat cream cheese in a large bowl until smooth.
Gradually beat in sugars until well mixed.
Beat in eggs, one at a time, until fluffy.
Beat in sour cream and grated orange rind; reserve 3 cups.
Beat cooled semisweet chocolate into remaining cream cheese mixture until well mixed.
Spoon one cup of the reserved plain cheese mixture over crust in springform pan.
Spoon half the chocolate-cheese mixture in for separate mounds over the plain layer.
Cover with another cup of plain cheese mixture; repeat layers.
Cut through batter with zigzag motion to marbelize.
Bake in preheated oven for an hour; turn heat off and leave in oven for an additional hour.
Remove from oven and cool on rack; refrigerate overnight.
Remove from pan and decorate with orange slices and chocolate leaves, if desired.