My kids love this "mulled wine"
(we call it "Glühwein").
1 litre red grape juice
2 tablespoons syrup
(I used blackcurrent syrup,
but I guess you can use any kind of red syrup)
1 lemon (juice)
1 orange (juice)
pinch of cinnamon
Gently heat the "wine" (don't let it boil).
Pour through a sieve before serving.