Recently I made a really nice Coopers Stout (using a kit). After fermenting I transferred to a Keg and threw in a bottle of Ginger Wine for added flavour. To begin with this tasted great (day I put it in). After a couple of weeks the Ginger flavour disappeared and only left a faint scent.
This time round I want to add a bottle of Sambuca to give a nice liquorice flavour. I plan to rack to secondary first and then after a couple of weeks transfer to the keg adding the Sambuca at this point.
Anyway, the question is, how much priming sugar should I use since the Sambuca (will a standard 0.75 litre bottle) is a liquor so contains a lot of sugar.....
Thanks.