Soak the raisins in the orange juice for 10-15 minutes to plump up. Grate the carrots on the coarse side of the grater and put into a large bowl. Add the orange zest, plumped up raisins and juice, spices and vinegar.
Stir in the mint leaves and season, then taste. You may want to up the acidity with a little lemon juice. Chill until needed.