Anyone else confused in the recipes by the odd way they put AAU instead of ounces?
I was going through an old issue of BYO tonight and found the solution to that riddle:
"AAU (or alpha acid units) are equal to the weight of hops (in ounces) times the alpha acid rating of the hops--AAU = w(oz.) x alpha acids(%). If the recipe calls for X AAU of hops and your hops are rated at Y% alpha acids, you would need X divided by Y ounces of hops. For example, if the recipe specified 12 AAU of hallertau hops and your hops were rated at 4% alpha acids, you would need (12/4=)3 ounces of hops."
Clear as mud?