-Be sure to use good quality, 100% juices for both the grape and pomegranate juices. Juice blends are mostly apple or pear juice and will not have the right flavor. If you can find a grape juice that isn't Concord grape variety, go with that. If Concord is all you can find, no problem, it's still yummy.
-You can change up the spices if you want. Use nutmeg, mace, cardamom, coriander seeds, black pepper, or fennel seeds.
-If you want to turn this into a traditional glühwein, replace the juices with 1 bottle or 750mL of red wine. Add as much sugar as desired. Add a total of ¾ to 1 cup (about 180mL to 235mL) of water and skip the tea, as it's not needed. Don't let it come to a boil, rather let it heat to just under a boil.