Show Notes
Is decoction mashing a timeless secret to world-class lager brewing, or just an outdated, energy-draining waste of brewhouse time? As lager brewing continues its massive resurgence in craft beer, many brewers hit a wall with thin mouthfeel, poor head retention, sluggish cold fermentations, or stubborn off-flavours. While it's easy to blame the yeast, the real problem might actually be hiding back in the mash tun. In this episode, Mark and Richard break down a landmark Czech brewing study by Enge et al. (2005) to explore how boiling physical portions of your mash fundamentally changes wort chemistry, yeast health, and final beer drinkability. We unpack: Natural Yeast Fuel: How decoction acts as a brewhouse nutrient engine, driving Free Amino Nitrogen (FAN) up to 207 mg/L to prevent cold fermentation stalls.
Thermal Cell Rupture: The physical mechanism behind boiling mash fractions to unlock bound proteins and starches.
Cleaning Up Off-Flavours: Why triple and double decoctions significantly reduce fusel alcohols, suppress unwanted esters, and cut acetaldehyde nearly in half (6.0 mg/L vs. 10.7 mg/L in infusion).
Finding the Sweet Spot: Weighing the energy costs of a 3.5-hour triple decoction against the practical efficiency and sensory benefits of a modern double decoction.
Whether you're team single-infusion or a traditional step-mash diehard, this episode will change how you look at lager wort preparation.
Featured in this Episode: Check out the research: Technological Aspects of Infusion and Decoction Mashing (Enge et al., 2005) Read our companion blog post: Does Decoction Mashing Actually Do Anything? (Plus Free Decoction Volume Calculator) Our full Lager Collection can be found here.
More from The Escarpment Labs Podcast
Are the "golden rules" in your brewhouse actually rooted in science, or are they just leftover dogma from 40 years ago? Many traditional brewing guidelines were completely true back when malts were less modified, yeast handling was imprecise, and hop processing was in its infancy. But thanks to modern maltsters, hop breeders, and yeast scientists, many of those old rules no longer apply. In this special Mythbusters-inspired episode, Mark and Richard turn off the Yeast Lightning Round timer and take the time to bust common brewing myths once and for all. We tackle: Myth 1: Three Hop Additions: Do you really need early, middle, and late kettle additions for optimal hop aroma?
How can breweries leverage their fermentation expertise, equipment, and brand loyalty to expand beyond beer without losing their core identity? The craft beverage landscape is evolving fast, and more breweries are becoming "CPG curious." Whether exploring non-alcoholic options, functional pre/pro/postbiotic drinks, energy beverages, or protein trends, moving into new categories brings real operational and brand challenges. In this episode, Richard sits down with Sara Heitmann (Brand Marketing & Strategy) and Dan Beaudoin (Product Development & Food Manufacturing, ex-AB InBev) from Birdway CPG. Together, they break down what craft breweries can learn from the wider consumer packaged goods world, examining case studies of non-beer fermentation ventures, product expansion pitfalls, and how brewery skillsets naturally translate into broader food and beverage innovation. In this episode, we cover: What to Brew (and What to Avoid): Evaluating brand extensions—from waters and functional pre/postbiotics to energy drinks and "protein-maxxing."
Are your yeast nutrients giving your fermentation precision support, or are they overloading your kettle with heavy metals and unpredictable mineral shifts? Many commercial worts are naturally deficient in zinc (<0.15 ppm), leading to sluggish fermentations and yeast stress. However, many off-the-shelf nutrients were originally formulated for wine or distilling rather than beer—sometimes adding massive doses of calcium or unwanted pro-oxidant metals like iron and copper. In this episode, Mark and Richard open up the laboratory vault to share findings from a multi-brewery study evaluating 47 samples across 16 commercial craft breweries. We break down: Precision Zinc Delivery: How Yeast Lightning reliably lifts zinc deficient worts (+0.125 ppm avg. increase) straight into the ideal 0.2-0.3 ppm sweet spot.
Why do yeast pitch rates vary so drastically between brewing shifts, even when everyone is using the same hemocytometer? Manual microscopic cell counts are standard practice, but they take time, carry operator bias, and can fall short when slurry densities change across strains. If you've ever faced stalled fermentations or batch-to-batch flavour shifts, inconsistent pitching volume might be the hidden culprit. In this episode, Mark and Richard are joined by Nick Brown (Brewing Sales Specialist at Aber Instruments) and Matt Cummings (Brewmaster at Equals Brewing) to explore capacitance technology — a real-time method for measuring viable yeast biomass directly in the line or tank. We cover: The Limits of the Scope: Where manual cell counts, slurry weight, and optical density fall short in a fast-paced production cellar.
Why does a beer taste squeaky clean at final gravity, only to turn into a slick, buttery mess three weeks after it hits the can? Diacetyl and its sneaky, odourless precursor (alpha-acetolactate) remain every brewer’s absolute worst quality control nightmare—especially during peak production season when cellar turns are tight. While dropping ALDC enzyme into the fermenter has become standard practice, relying on it as a silver bullet without fixing underlying yeast nutrition can leave your beer vulnerable to hop creep and post-packaging spikes. In this episode, Mark and Richard break down the complete cellular biochemistry of diacetyl prevention, ALDC limitations, and cellar-tested QC checks. We explore: The Precursor Trap: How alpha-acetolactate hides in clean-tasting beer and oxidizes into buttery diacetyl after packaging.