Fermentation in progress

A seven-day journey in flour, water & time

Bread that begins
with nothing but
patience.

No commercial yeast. No shortcuts. Just a jar of flour and water, a week of feeding, and the oldest leavening method on earth. Follow the full journey — from the first bubble in the mother to the first crack of the crust.

Begin the journey

Stage I

Creating the mother

Days 1 – 7

The mother, day by day — flat, then bubbling, then alive

Equal parts flour and water. That's the entire recipe. Wild yeast and lactic acid bacteria live on every grain of wheat and in the air of your kitchen — the mother is simply a home you build for them.

Each day you discard half and feed her fresh flour and water. By day three she sighs her first bubbles. By day five she smells of green apples and yogurt. By day seven she doubles in six hours and you know: she's ready to raise bread.

Day 1Mix 50g whole wheat flour + 50g water in a clean jar. Cover loosely.

Day 2–3Feed daily: discard half, add 50g flour + 50g water. First bubbles appear.

Day 4–6Feed twice daily. Mark her height with a rubber band and watch her climb.

Day 7The float test: a spoonful dropped in water floats. She's strong enough to bake.

Stage II

Building the dough

Hours 0 – 12

Stretch & fold — strength without kneading

Sourdough is not kneaded. It is coaxed. Mix flour, water, salt, and a few spoonfuls of the bubbling mother — then let time build the structure for you.

Every half hour, wet your hands, lift one side of the dough high, and fold it over itself. Four folds, four times. Between each set, the dough rests, ferments, and quietly transforms from a shaggy mass into something smooth, glossy, and alive — jiggling like a held breath.

Hour 0 flour + water, mix into a shaggy dough and rest alone for an hour. Gluten begins forming itself.

Hour 1Add the active mother and mix it in, then add . Pinch and squeeze to combine.

Hours 1–4 every 30 minutes. Watch the dough turn silken.

Hours 4–12 then shape, then a cold overnight proof in the fridge.

Stage III

Into the fire

45 minutes at 245°C / 475°F

Lid off at minute 25 — when the crust learns its color

The oven spring is the payoff for a week of patience. Cold dough meets a roaring Dutch oven, trapped steam keeps the crust soft for those first crucial minutes — and the loaf leaps upward, splitting along your score line into a proud ear.

Then the lid comes off, and the kitchen changes. The smell of caramelizing crust at dusk, the window fogging, the tick of the cooling stone — this is why people fall in love with baking bread.

−1 hourPreheat the Dutch oven at 245°C / 475°F until it's ferociously hot.

Minute 0 the cold loaf in one confident stroke, lower it in.

Minute 0 mist the dough with water or add a couple of small ice cubes to the Dutch oven, then lid on.

Minute 25Lid off. Lower the oven to 220°C / 425°F and bake 20 more minutes until the crust is deep mahogany.

+1 hourWait. The crackle as it cools is the bread still cooking. Don't cut early.

Stage IV

The loaf

Worth every hour

Mahogany crust, singing ear, wild open crumb

Tap the bottom: it should sound hollow, like a drum. The crust shatters; the crumb inside is cream-colored, glossy, and riddled with wild, irregular holes — the fingerprints of fermentation.

The flavor is what no commercial yeast can fake: gentle tang, deep wheat sweetness, a whisper of the week it took to get here. Butter while it's still barely warm. Share it. Then feed the mother again — she's hungry, and there's always a next loaf.

The crustDeep mahogany with blisters — proof of a long cold proof.

The earA raised ridge along the score, lifted by a violent oven spring.

The crumbOpen and glossy, never gummy — patience made visible.

The motherStill in her jar, fed and resting, ready for the next bake. She can live for decades.

The Workbench

Tools of the trade

The baker's math

Set your loaves and hydration — the formula adjusts in real time. Levain is held at 20% and salt at 2% of flour weight, the classic ratios.

Loaves 2

Loaf size 900 g

Hydration 75%

Bread flour915 g

Water685 g

Active levain the mother, at her peak185 g

Fine sea salt18 g

Total dough1800 g

70% is the easiest place to begin; 75% is forgiving; 80%+ rewards experienced hands with a wilder crumb.

Feeding the mother

Log each feeding and she'll tell you how she's doing. A mature starter at room temperature likes to eat every 12–24 hours.

No feedings logged yet Press the button after her first meal.

Her diary is empty

0 feedings on record

The baker's weekend

Once the mother is alive, every loaf follows the same gentle rhythm. Here's the full arc, Friday evening to Sunday lunch.

Fri, 7 pm

Feed the mother so she peaks overnight.

Sat, 9 am

— flour and water rest together.

Sat, 10 am

Add mother & salt. Begin stretch & folds.

Sat, 2 pm

Shape the boule. Into a banneton, into the fridge.

Sun, 9 am

Preheat the Dutch oven to 245°C / 475°F.

Sun, 10 am

Score, bake, and let it sing on the rack.

Sun, noon

First slice, good butter, no regrets.

Mr Crumbs explains

What is autolyse?

Autolyse (aw-toh-LEEZ) is the simplest step in bread baking: mix only the flour and water, then walk away for 30–60 minutes. No starter, no salt, no kneading — just rest.

While you do nothing, chemistry does everything. Water fully hydrates the flour, and two proteins — glutenin and gliadin — begin linking into gluten networks entirely on their own. Enzymes called amylases also start breaking starch into simple sugars, which will later feed the wild yeast and deepen the crust’s color and flavor.

Why no salt yet? Salt tightens gluten and slows the enzymes — adding it later lets the dough develop freely first.

Why no starter yet? The clock on fermentation shouldn’t start until the gluten has a head start.

The result A smoother, more extensible dough that needs far less folding — and a more flavorful loaf.

Buddha explains

The art of bulk ferment

Bulk fermentation is the first rise — the long, quiet hours when the whole mass of dough ferments together as one. Nothing is asked of you but stillness; the dough is doing the work.

Within it, the wild yeast from your mother breathes out carbon dioxide, inflating thousands of tiny bubbles that the gluten net holds like lanterns. Beside the yeast, lactic acid bacteria slowly create the gentle tang that makes sourdough, sourdough. Flavor cannot be hurried — it can only be allowed.

Watch the dough, not the clock It is done when it has grown by half, domes at the edges, and jiggles like a held breath — 4 to 8 hours, ruled entirely by temperature.

End it too soon and the loaf is dense, its spirit unrisen.

End it too late and the gluten exhausts itself — the dough slackens and collapses. The middle path bakes the finest bread.

Strength training for dough

Why stretch and fold?

A fresh dough is loose and slack. Each time you lift, stretch, and fold it over itself, you align and lengthen the gluten strands — the same way a stretched muscle grows stronger. Four gentle folds build a web strong enough to trap gas and hold a tall, open crumb.

But strength has a limit. This is why sourdough is rarely kneaded in a machine. A mixer can build a near-perfect, ultra-tight gluten network in minutes — and that is exactly the problem.

Wild yeast is gentle Your starter’s natural yeast is a fraction as forceful as commercial baker’s yeast. It produces gas slowly and with far less pressure.

An over-strong dough fights back A dough kneaded rigid by a mixer becomes so tight and elastic that weak wild yeast can’t inflate it — the loaf stays dense and barely rises.

The fold is the middle way Hand folds build just enough strength to hold the gas, while keeping the dough extensible enough for slow, gentle yeast to lift it. Strong, but never stiff.

Dr Brine explains

When — and where — to salt

Salt is measured at roughly 2% of the total flour. It must be diluted across the whole dough, never concentrated in the mother.

Put that same pinch of salt into your starter alone and the math changes completely. The mother holds only a small share of the flour, so the salt there lands at closer to 10% concentration — high enough to put your wild culture in a chokehold.

Salt doesn’t kill — it restrains Even at 4–6% concentration, salt won’t kill the yeast or bacteria, but it severely restricts their ability to multiply and produce gas or acid — leading to a much slower rise.

Why the dough, not the mother Added to the full dough at ~2%, salt seasons and controls fermentation without crippling the slow, gentle wild yeast. Added to the mother at ~10%, it would stall her entirely.

The strength bonus Salt tightens the gluten network — it draws the strands closer, firms a slack dough, and improves gas retention. Adding it now, alongside the folds, is part of how the dough is built strong enough to hold its rise.

Professor Steam explains

Why steam the oven?

The moment the cold loaf goes in, a mist of water or a couple of small ice cubes flash to vapor against the screaming-hot cast iron — a brief, intense burst of steam sealed inside the Dutch oven.

That steam is what separates a good loaf from a great one. It keeps the crust soft and flexible through the first crucial minutes, so the dough can expand to its full height before the surface sets.

It buys time for oven spring A flexible crust stretches instead of cracking, letting the loaf leap upward and bloom fully along the score.

It builds the crust you want Steam gelatinizes the surface starches, which later set into a crust that is crisp, blistered, and glossy.

It stops a premature skin Without steam the surface dries too fast, forming an early crust that hardens, caps the loaf, and chokes off the rise.

The baker explains

Why score the loaf?

A single confident slash with a lame (a razor on a handle) just before baking is the last thing you do to the dough — and one of the most important. As the loaf hits the heat it wants to expand violently. The score tells it where to.

Give it no escape route and the loaf bursts wherever it’s weakest — tearing open at the side or bottom in a random, ugly blowout. A deliberate cut hands that energy a door.

It controls the oven spring The score is a planned weak point. The dough surges up and out through it, opening into a tall, even loaf instead of splitting at random.

It creates the ear A cut made at a shallow 30–45° angle lifts a flap of dough that sets into the crisp, raised ridge bakers prize — the “ear.”

It’s your signature Beyond function, scoring is decoration — wheat stalks, leaves, crosshatch. One deep cut for spring; shallow lines for art.