I seem to say this a lot but I'm not puritanical. I will happily have a glass of wine but I'm of the view where if you can make small changes to your life without even noticing which help your health, perhaps you should.
When I've made mulled wine in the past, I've added masses of sugar to get the same kind of flavour you can get when buying it in a Christmas Fair, now I'm more than a little convinced that I may have been drinking mulled grape juice all along (or at least a proportion of it.) Still, older and wiser now, I can now make my own and this is how to do it.
Mulled Grape Juice - makes enough for 1, easily doubled or more.
250ml, half a pint of Red grape juice
1 green cardamom, split open and put in seeds, pod and all
4 coriander seeds
1/2 tsp ground (powdered) cinnamon
Half a lemon
Heat the grape juice with the spices in a saucepan until bubbling. Take off the heat and allow to infuse for a couple of minutes. Add a squeeze of lemon juice and strain into a heatproof glass (a tea-strainer works well for this).