THE MEDIEVAL BAKERY: SOURDOUGH MANUAL

The complete reference for the living engine behind every loaf — what is actually living in your jar, how to read it, how to fix it, and how to bake the way it worked for two thousand years.

You built the starter. You followed the recipes. The first loaf came out dense. The second one collapsed. The third smelled like nail polish. You do not know whether to throw the starter out or rescue it. You do not know if the dough overproofed or underproofed. You do not know why the crust came out pale and the crumb came out gummy.

The cookbook gave you the recipes. The Sourdough Manual gives you the engine that drives them.

This is the deepest volume in the Medieval Way Field Manual series — the masterclass for bakers who want to understand why their bread does what it does, not just follow the steps. 59 pages of sourcing-grade science, technique, and rescue protocols, in the same parchment-and-ink style as the cookbook.

What's Inside

Six chapters covering every dimension of sourdough mastery — from microbiology to regional tradition.

Chapter I — The Science of Sourdough

What is actually living in your jar. Named studies from the Belgian KU Leuven (2014), the Institute of Food Research Norwich (2003), the University of Naples (2011), the University of Bari (2018), and the University of Hohenheim (2017). The three reactions that matter — phytic acid degradation, gluten degradation, FODMAP digestion — and the two acids (lactic and acetic) that define every sourdough's flavor.

Chapter II — The Starter, Master Class

Building, feeding, reading, traveling with, reviving. The four build methods. The feeding-ratio math (1:1:1 to 1:10:10). The three states — active, dormant, dead. The resuscitation protocol for starters neglected for months. How to gift, dehydrate, freeze, and pass on a heritage culture.

Chapter III — The Dough

Hydration percentages explained from 50% to 100%+. The autolyse science (Bologna 2008). Bulk fermentation as a function of temperature × time × inoculation. Stretch-and-fold vs. kneading. The cold proof — the single biggest flavor upgrade available to a home baker.

Chapter IV — The Bake

Why the Dutch oven matters more than the oven itself. Steam in the critical first 12 minutes. Scoring at 30° for the ear. The Maillard reaction. Why you cannot slice for 2 hours (or 8, for rye). Storage in linen, wood, and beeswax — and why refrigeration destroys bread.

Chapter V — The Rescue

Twenty-five named failures, organized by stage — starter, bulk fermentation, shape & proof, bake, storage. Each with cause, fix, and prevention. The diagnostic decision tree for when to throw it away vs. rescue it. The 11pm-Sunday-night reference manual every home baker eventually needs.

Chapter VI — The Regional Traditions

Italian lievito madre, French levain, Danish surdej, Bavarian Anstellgut, Russian zakvaska, and the San Francisco Lactobacillus sanfranciscensis tradition. How to build a starter that approximates each. Heritage starter lineage — and how your great-grandchildren may inherit yours.

What You Get

• 59-page premium PDF in the same parchment-and-ink design as the cookbook
• Six chapters, six exercises, twenty-five named failure cases
• Named sources for every scientific claim — Florence, Naples, Bari, Hohenheim, Copenhagen, KU Leuven, Lund, Norwich
• The 25-failure diagnostic that turns home bakers into bakers
• Six regional traditions with build protocols for each
• Companion to The Medieval Bakery: Practical Recipes
• Volume III in the Medieval Way Field Manual series
• Instant download · works on any device · printable for the kitchen wall

Who This Is For

You, if you bought the cookbook and one of your loaves failed. You, if your starter died on day 12 and you do not know why. You, if you keep baking the same recipe and the result keeps shifting based on temperature, hydration, and time — and you want to understand the variables instead of guessing them. You, if you have read every Reddit thread on sourdough and still do not have a single coherent reference book to hold in your kitchen.

This is the reference. It is what we wished we had when we started.

Why This Is The Premium Volume

The Cookbook is the entry point. The Sourcing Guide is the supply chain. The Sourdough Manual is the masterclass.

Every recipe in the cookbook works because of the science in this manual. Every supplier in the Sourcing Guide matters because of the chemistry described here. This is the volume that turns follow the recipe into understand the bread.

The medieval baker who kept his Mutter for forty years did not know the word Lactobacillus. He could not have named Saccharomyces cerevisiae. But he managed an ecosystem of fifty distinct microbes by smell, by feel, by the rhythm of feeding — with a competence that modern science is still catching up to.

This manual is that competence written down.

Bake the science. Master the engine.

The choice is yours.