Our Impression: We were recently inspired to expand upon our IPA/IPL brewing techniques after reading The New IPA by Scott Janish.  This is in our opinion the most important book for anyone to read regarding IPA brewing, and the research is relevant for brewing many other styles as well.  American IPAs are historically quite young and the research surrounding intensely hop forward beers is rather slim.  Janish compiles research so we can better understand the interaction of the various types of yeast and hops, and he explores processes for achieving complex, fruity hop expression.   We’ve used this book as a starting point for creating an IPL with more pleasant and expressive hop character, and without the vegetal grassiness.