Mulling means heating. Wine is normally heated up with the addition of some sweetener(I use brown sugar, you can use white sugar or honey. In no circumstances use arrificial sweetener). Plus a few spices--cloves, nutmeg and cinnamon are standard. A little orange juice, and some bits of arange and apple floating about are good. A bit of brandy as well is nice addition. Most people use red wine, but I've had mulled white. You put it in a big pan on the stove, keep it hot, and have a ladle to serve it to guests in glasses. (That's the wine, guests who dont wear glasses are allowed mulled wine).. There you go, youre ready for your pre-Christmas party now.