Notes from the lab.
Practical articles on coffee, brewing, espresso, tasting and the café business, from The Zariya Academy in Kolkata. 16 articles. Last updated 13 October 2026.
The Importance of Freshly Roasted Coffee: A Beginner’s Guide
Coffee is a fresh product. Learn why roast date matters, how long beans stay at their best, and how to store and buy coffee that tastes alive.
The Science of Coffee Extraction: What Makes or Breaks Your Cup?
Extraction decides whether coffee tastes sour, bitter or balanced. Learn the five variables you control: grind, time, temperature, ratio and water.
Water Quality & Coffee: Why It’s More Important Than You Think
Coffee is mostly water, and water shapes extraction. Learn which minerals help, why distilled water fails, and how to improve your brewing water.
How to Brew Better Coffee at Home: What Nobody Tells You
Make café-quality coffee at home. Six practical fixes: fresh beans, the right water, a burr grinder, a scale, brew temperature and patience.
The Role of Acidity in Coffee: Bright, Tangy, or Sour?
Acidity is not sourness. Learn where coffee acidity comes from, how altitude, processing, roast and brewing change it, and how to tune it.
Bitterness in Coffee: Is It Always a Bad Thing?
Bitterness is part of coffee, not always a flaw. Learn what causes it, how to tell good bitterness from bad, and how to tune it in your cup.
The Perfect Espresso Shot: A Story of What ACTUALLY Matters
Numbers get you started. Feel finishes the shot. Learn what matters in espresso: grind and flow, tamping, pre-infusion, the stream and taste.
Understanding Balance & Complexity in Coffee: What Makes a ‘Perfect’ Cup?
What makes a perfect cup? Not one answer. An architect’s view of balance, complexity and the lifelong search for a better cup of coffee.
How to Differentiate Your Café in a Saturated Market
Most cafés fail because they are forgettable, not because they are bad. Four ideas for building a café that is hard to replace.
Why Every Café Needs Signature Drinks (& How to Create One That Sells!)
A signature drink gives a café identity, loyalty and margin. Five steps to design one that is distinctive, approachable and profitable.
What Really Happens During the First Crack? The Science and Intuition Behind Coffee Roasting
First crack is the moment green coffee becomes roasted coffee. Learn the science behind it and the senses a roaster uses to read it.
The Roast Spectrum: Understanding Light, Medium & Dark Roasts
Light, medium or dark? Learn what each roast level tastes like, who it suits, and how to choose by the coffee, the brew method and your taste.
Why Every Barista Should Learn Cupping to Improve Brewing & Customer Experience
Cupping builds a barista’s palate, sharpens brewing decisions and improves how you talk about coffee. Learn what cupping is and how to start.
The Role of Cross-Sensory Training: How Wine, Chocolate & Whiskey Tasting Can Improve Your Coffee Palate
Tasting wine, chocolate and whiskey can sharpen your coffee palate. Learn what each teaches you and how to build a simple sensory routine.
The Espresso Martini: History, Variations & Modern Twists
The Espresso Martini was created in London in the 1980s. Learn its history, the classic recipe and six variations, from rum to nitro.
Caffeine & Alcohol: The Science Behind the "Wide Awake, Drunk" Effect
Caffeine can hide how drunk you feel, but it does not make you sober. Learn what happens when caffeine and alcohol mix, and how to stay safe.