After fermentation is complete in about 4 weeks. Let it lager for 1 month at near freezing temperatures. Transfer to a corney keg.
Place in freezer, check every 30 minutes by shaking the keg. One the ice crystals start to form you will hear them hit the side of the keg.
You will want to pull it out of the freezer when about 20% of the beer has turned to ice, you will have to guess the first few times you do this. Transfer the still liquid to another container, leaving behind the ice. This will darken the beer as well as increase the ABV.
Allow the beer to lager another 4 weeks before bottling or serving.
