Peel a medium size orange and save the peels. Pierce the cloves into one or more of the orange peels and set aside. Extract the juice from the orange and keep aside. Optionally, you can strain it to avoid any citrus fibers in the drink.
Turn the instant pot on Saute mode on HIGH. Add sugar and water in the Instant Pot. Bring water to a boil. Stir once to dissolve the sugar.
Reduce the Saute setting to LOW on the Instant Pot. Add orange juice, orange peels, cinnamon, star anise, and the orange peels with cloves in it. Simmer for 2 minutes
Add red wine and let it steam, not boil. Takes between 4-6 minutes, depending on the size of the pot.
Hit Cancel and Turn on 'Keep warm' mode. This will keep the Mulled wine at a nice warm temperature for the evening. Add the rum or grand marnier just before serving.
Just follow the same instructions with a saucepan. Keep the heat on low to make sure that once the wine is added, it does not boil.
Note: The nutrition facts below are my estimates. If you are following any diet plan, I recommend cross-checking with your preferred nutrition calculator.