If you are a professional chef, a food science student, or a passionate home cook, you have likely heard the whisper of a holy grail: Leksykon Smakow . Specifically, the 2021 PDF edition has been circulating in culinary forums as a must-have digital toolkit.

If you can find a legitimate 2021 digital copy, grab it. If you only find the 2015 version, grab that too—just know that the culinary world moved toward fermentation and vegan umami in the last six years.

But what exactly is this document, and why is everyone searching for the 2021 version? Let’s break down the hype.