Did a quick Goooooooogle. Been some experiments done by people in the US
http://www.homebrewtalk.com/f12/coca-cola-...843/index3.html
One tip was to reduce the coke down to a syrup before adding.
Currently midway through the boil on this extract version:
Coke Is It!
American Pale Ale
Recipe Specs
----------------
Batch Size (L): 4.0
Total Grain (kg): 0.520
Total Hops (g): 9.60
Original Gravity (OG): 1.047 (P): 11.7
Final Gravity (FG): 1.009 (P): 2.3
Alcohol by Volume (ABV): 4.93 %
Colour (SRM): 12.7 (EBC): 25.0
Bitterness (IBU): 31.1 (Average)
Brewhouse Efficiency (%): 70
Boil Time (Minutes): 60
Grain Bill
----------------
0.380 kg Dry Malt Extract - Light (73.08%)
0.020 kg Crystal 120 (3.85%)
0.020 kg Crystal 30 (3.85%)
Hop Bill
----------------
1.6 g Centennial Pellet (9.7% Alpha) @ 60 Minutes (Boil) (0.4 g/L)
4.0 g Centennial Pellet (9.7% Alpha) @ 20 Minutes (Boil) (1 g/L)
4.0 g Centennial Pellet (9.7% Alpha) @ 10 Minutes (Boil) (1 g/L)
Misc Bill
----------------
150mL of Coke, reduced down to about 30ml of syrup, added after 6 days in primary
Fermented at 19C with Safale US-05