Tatera’s brewing process starts like that of any ale. He boils water and malt to create wort—unfermented beer—then cools the mixture and adds yeast to ferment it. Instead of finishing the brew there, he builds a concentrate. He vacuum distills the mixture and reserves the ethanol, leaving behind a syrup. Then he starts the process again, adding the syrup instead of water. He ferments again, removes the ethanol, and repeats.