2. In a large bowl with a mixer on medium speed, beat cream cheese and 1/2 cup of sugar for 2 minutes. Beat in pumpkin, then eggs, 1 at a time. Reduce speed to low, beat in evaporated milk, cream, liqueur, vanilla, cinnamon, nutmeg, and pinch of salt once well mixed.
3. Pour 1 1/2 cups of sugar in a saucepan in medium heat and mix until sugar is caramelized. Pour caramelized sugar to cooking pan and spread all around the base.
4. Place the pumpkin mix in cooking pan. Place entire cooking pan inside a larger pan with 1/2" water.
5. Bake 1 hour and 10 to 15 minutes until knife inserted 1 inch from edge of custard comes out clean. Remove loaf pan from baking pan to cook from 1 hour. Refrigerate for 8 hours or overnight.
6. (optional) spread some fresh orange zest to the top on the cheesecake once it is ready to eat.