I'm attempting a coffee stout as a Christmas present for my family. I brewed this last night - I've fallen behind in my brewing schedule so I may well have to label it "drink me in 2 weeks"!
I brewed to 23l - last time I brewed it short but frankly I can't bear the thought of having less beer than expected!
I added
1kg brewing sugar
300g treacle
500g dark spraymalt extract
And got an OG of 1060.
Once it has finished fermenting I plan on adding 500g of coarsely ground coffee beans to the FV for the last 15 hours of fermentation. I have a large muslin sack that is almost as big as the FV that I use for making cold brew coffee in my coffee shop. So the technique is exactly the same as making cold brew, except for instead of using cold water, I'll be using cold fermented beer to extract the coffee.
For a 23l batch I would use just over 1kg of beans for cold brew, my reasoning for using 500g of beans is that the light roast coffee I'm going to be using is very delicate in flavour and so I think it will take a lot to punch through flavour of the stout! It's going to be an expensive brew will the extra fermentables and around �ã12 worth of coffee so fingers crossed this works! Will report back..