DirectionsPreheat oven to 350F (180C).
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.
Grease one cheesecake pan with butter and coat lightly with bread crumbs.
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.