Basically by putting aromatic spices and fruits into a pot simmering over low heat, brings out the flavors and aromas. Whether you simmer apple cider, wine or water…
Bring the mixture to a very gentle simmer over low heat.
Don't let it boil: this can cause spices to turn bitter.
To really allow the flavors of the spices to infuse into the beverage, you should allow the mixture to simmer on the stovetop for at least half an hour. You can keep the pot warm for several hours or putting a slow cooker on low heat is the best choice.