what's the batch size of this recipe?
Batch size is 5 gallons, boiling volume is about 5.75 gallons to allow for some evaporation. And I was mistaken about the IBUs being 23, it is actually closer to 27. According to Bell's, Oberon has 23 IBUs, but I did a slight miscalculation when converting from my extract recipe to all-grain. I didn't cut down the hop additions enough due to the larger boil volume. To keep the IBUs down to 23, you should cut down the 60 min. hops from 1 oz. to about 3/4 oz. Sorry about the mix-up, I have been in the process of updating all my recipes now that I have switched to mostly all-grain brewing.