1/2 c. graham cracker crumbs
1 tbsp. granulated sugar
2 tbsp. butter, melted
1 sq. unsweetened chocolate
3 pkg. (8 oz. each) cream cheese
3/4 c. firmly packed light brown sugar
1/4 c. granulated sugar
4 eggs
2 pt. (4 c.) sour cream
1 tbsp. grated orange rind
6 sq. semi-sweet chocolate, melted & cooled

1. Combine crumbs, 1 tablespoon sugar, butter and unsweetened chocolate in small bowl. Press into bottom of lightly buttered 8 x 3 inch spring form pan. Refrigerate.

2. Beat cream cheese in large bowl until smooth. Gradually beat in sugar until well mixed. Beat in eggs, one at a time, until fluffy. Beat in sour cream and rind. Reserves 3 cups.

3. Beat cooled chocolate into remaining cream cheese mixture until well mixed.

4. Spoon 1 cup of the reserved plain cheese mixture over crust in pan. Spoon half the chocolate - cheese mixture in flour. Separate mounds over plain cheese layer. Cover with another cup of reserved plain cheese mixture. Repeat layers. Cut through batter with zigzag motion to marble. Bake in preheated oven (350 degrees) for 1 hour. Turn off oven; leave in oven 1 hour. Cool on rack. Refrigerate overnight. Decorate with orange slices and chocolate leaves.