I bought this thinking it would get into the culinary side, but it's really a commercial operations manual—which is fine, that's what it says on the cover. The grade specs for root diameter and blemish tolerance were useful. I just wish chapter 8 had more depth on the prepared horseradish shelf-life question; it gave a number but not the storage condition math behind it that chapter 5 hinted at. A good reference overall, but not a complete one.

The chapter on heat chemistry alone is worth the price. I've been processing horseradish for six seasons and I always knew vinegar timing mattered, but I never understood the sinigrin to allyl isothiocyanate mechanism at the level this book lays out. Now I can dial in our grind fineness and acid soak to hold heat for three extra days in the walk-in. The troubleshooting chapter saved me from chasing a mold issue that was actually a humidity problem. This is my new manual.

I appreciate that it doesn't talk down to you and it doesn't oversell. Chapter three's decision framework for fresh versus prepared root based on throughput was genuinely helpful for our restaurant group. The storage specs and the explanation of why temperature shifts cause black rot have cut our spoilage noticeably. I dropped one star because the supplier list in chapter six is more descriptive than it is contact-rich—but as a reference handbook, not a trade directory, it does its job.