Jamie Oliver's website, I just had to try it and it ended up being perfect! Sweet and tangy with a bit of a bite at the end ;) Enjoy!
Best Ginger Beer
4 oz Ginger Root (about 1 medium root)
4 TBS Brown Sugar or other sweetener
1 25oz bottle Perrier or Pellegrino
Shred ginger with a course cheese grater (you can leave the skins on if you like). Place the ginger and it's juice into a bowl and add the sugar. Peel the lemons lightly and add the zest to the mix. Pound for about 30 seconds with a pestle or heavy object like a rolling pin to mix the flavors. Add the sparkling water and let sit for 10 minutes or so. Strain the liquid into a pitcher and refrigerate till cold or serve with ice. If it's too bitter, just add a touch more sugar till it's the way you want it.