homemade "Grand Marnier"
There is another rum based orange liquer from Venezuela that I have had, quite yummy: Santa Teresa. Try to get a taste of that, and see what you think. I'm a rummy from way back.
I was trying to "go homemade" to save money, and just have some fun playing with it. If I buy GM, it disappears way too fast....
To make a really good version of Grand Marnier you need to start with cognac or brandy and the peels of curacao oranges (bitter orange), and assorted spices, then play with it from there.
I would make it about the same way as with orangecello and add some appropriate spices like cinnamon, nutmeg, allspice, mace, clove, ginger etc... in very minute amounts.
Sunday I tried the most amazing curacao orange liquer from Martinique/France made with aged dry rum. Creole Shrubb, Liqueur Creole Clement. It blows any other orange liqueur out of the water including the super premium versions of Grand Marnier and the original Curacao liqueur.