I vaguely followed this recipe: http://www.winemag.com/Wine-Enthusiast-Magazine/April-2008/Homem... using a pretty awful white that was left at our place at some party.

1/2 bottle white wine (I used the rest for cooking)
5 juniper berries
2 springs fresh rosemary
1/2 tsp herbs de provence
1/2 cup young brandy or eau-de-vie (I used some leftover juniper edv from our Italy trip to really go all-in on the botanicals)

Toast the herbs, then add the wine and bring to boil. Take off heat, cover and leave steeping overnight.
Strain, add the brandy... done.