In one of my latest posts, I investigated the effect of puck preparation, and in particular the addition of a dry paper filter above the espresso puck, affects the hydraulic resistance of the syste…| Coffee ad Astra
In this post, I present an experiment showing that deep WDT helps improve repeatability, and I discuss how to improve espresso preinfusion.| Coffee ad Astra
In this blog post, I explore the possibility of a different way to profile espresso shots with the Decent machine to help dialing in faster.| Coffee ad Astra
In this post I present an updated methodology to measure TDS with a 0.01% precision using a refractometer.| Coffee ad Astra
[Edit April 20 2021: Chris Satterlee generously developed install packages for both OS X here and Windows here ! His full GitHub repo is here. I’m very thankful for this help (it’s not …| Coffee ad Astra
Table of Contents Introduction Percolation and Immersion Why use a V60 ? The Brew Variables Coffee to Water Ratio Coffee Beans Quality and Roast Profile Grind Size and Uniformity Coffee Freshness F…| Coffee ad Astra
4 posts published by jgagneastro during January 2019| Coffee ad Astra
Hello all ! I am so thrilled to announce that my second book The Physics of Espresso is finally out ! This one took a while longer than I expected, and you’ll understand why when you get your…| Coffee ad Astra
I will be presenting a conference on the topic of espresso dynamics during SCA 2024 in Chicago !| Coffee ad Astra
This post presents a deep analysis of 300 particle size distributions for various espresso grinders| Coffee ad Astra
This post presents the Pulsar dripper with my current favorite brewing recipe.| Coffee ad Astra
In this post, I talk about ways in which I have recently improved my puck preparation for espresso.| Coffee ad Astra
Announcing a coffee class during the Boston SCA expo| Coffee ad Astra
I come back to my last experiment and explore whether the difference in gravimetric vs volumetric flow could be due to changing shot TDS.| Coffee ad Astra
[Edit January 30, 2019: After receiving some feedback about this post, I would like to address a few things that I think were not clear enough. I’d like to thank Scott Rao for his comments. First, …| Coffee ad Astra
Recently, Barista Hustle posted a very interesting video on YouTube. I am embedding it to this blog post to make sure that you view it before reading more. I found this video rather illuminating, b…| Coffee ad Astra
In this post, I discuss my updated understanding of the mechanism by which astringent compounds can be extracted from coffee.| Coffee ad Astra
In the past weeks, I have been experimenting with the AeroPress combined with the Prismo attachment, and I tried one small hack that produced a surprising result. I inserted a pasta strainer mesh l…| Coffee ad Astra
In this post, I discuss the AeroPress and how it can be used to reach flavor profiles similar to cuppings and high-EY pour overs.| Coffee ad Astra
In this post, I compare several shots pulled with the Niche to others pulled with the EG-1 and SSP ultra-low-fines burrs.| Coffee ad Astra
I often heard worries in the coffee community about a difference of quality in the coffee grind size distribution when grinding with a full hopper versus a single dose of coffee in an otherwise emp…| Coffee ad Astra
