Liquid Intelligence, by Dave Arnold

Liquid Intelligence by Dave Arnold is one of those books that I was told was a must-read for bartenders, and I had only read it when I was 2 years into the industry. I regretted not reading it earlier.

The technical knowledge covered in the book was not the main highlight for me personally; it was more the change of perspective in terms of consistency and dilution.

Back when I was still a junior bartender, I always knew that ice was important for temperature and dilution, but I'd never really taken it seriously. Like most bartenders early in their career, I thought that good drinks came down to recipes, flavor pairing, and balance (I later found that dilution was also part of this equation). I guess that that was also one of the reasons I didn't read Liquid Intelligence earlier in my career. It wasn't a book about recipes; it was more technical and philosophical. However, the good thing about this book is that it breaks things down systematically.

Temperature, dilution, sugar, acid, etc – everything becomes something that you can measure and control. And when you can measure and control variables, you can achieve consistency. The most important lesson I got from the book is the understanding of dilution, and to understand dilution, you need to understand your ice and the temperature of your spirits.

Back then, I always thought dilution was a "byproduct" from stirring and shaking, and the main point for stirring and shaking was just to cool the liquid; but that's not quite true. To achieve true consistency, dilution should be the main target and not a byproduct – that way, the drinks will taste the same every time, regardless of who's behind the bar.

Ice is one of the most important areas the book covers. The size, clarity, and shape of the ice will affect the temperature and the dilution. In terms of shaking, the size of the ice will affect aeration as well. For an experienced bartender, all these might sound like years and years of experience and instinct, but for young bartenders and prosumers, I think the book explains it pretty well, and it will change your perspective regarding this topic.

One more topic from the book that is very important is pre-batching and pre-diluting. This concept is not common in traditional cocktail books, but for efficiency and consistency,

it's actually very convenient if done properly. Regardless of what the book says, I think experimenting with different products is important in terms of pre-batching and pre-diluting, as some ingredients might react to each other differently and might change the flavor and texture of the drink. The way you store your prebatches might affect the consistency of the drink as well. From a working bartender's perspective, this is probably one of the most practical and realistic takeaways in the entire book.

That said, some of the processes mentioned in the book – like centrifuge, liquid nitrogen, and rotavap – might not be realistically relevant to the majority of bartenders and prosumers out there, but I still recommend people to read it like a lab notebook just to understand that there are different ways to extract (or remove) flavors.

For junior bartenders, understanding the concept of dilution is way more important that memorizing recipes. Instead of relying of your palate (which younger bartenders struggle with), you should be thinking more in terms of balance and consistency, and that would be helpful for the long run.

For prosumers, don't worry if the book seems too complicated, because a lot of the ideas can be applied without specialized equipment. Even simple things – better ice, prediluted frozen martinis etc. – can elevate your drinks significantly.

Liquid Intelligence may not be an easy read, but for anyone serious about bartending and cocktails, it's definitely a must-read, and it might be one of the most valuable books you can read out there.