Tuscan Cheesecake

3 lb Ricotta cheese
8 Eggs
2 c Sugar
1 c Milk
2 Oranges, grated zest only
2 Lemons, grated zest only
2 2/3 oz Grand mariner
1 tb Clarified butter
1/4 c Plain breadcrumbs

Preheat oven to 350 F.
Beat ricotta cheese with blender until smooth. Add eggs, sugar, and milk. Blend until well mixed and smooth. Add orange and lemon zest and Grand Mariner. Mix well.
Grease one cheesecake pan with butter and coat lightly with breadcrumbs. Fill pan 3/4 of the way with cheesecake mixture. Set pan in a larger pan filled half full with water and bake 1-1/4 hours. Turn oven off, leaving the cake within. Let stand for one hour. Remove, let cool, and refrigerate.