Once the wort is in the kettle, and the enzyme treatment is over, the brewer should proceed to the boil. Brut IPA is supposed to have a lot of hop aroma, but not as much hop bitterness as a normal IPA. How much bitterness is, of course, up to you. The main things to consider when choosing a level of bitterness are the OG and FG of the beer, and — of course — your personal preference.