Our House Sourdough: The Complete Mumbles Cafe Bakery Story

Introduction

Most cafes buy their bread. We bake ours — every morning, from scratch, at 5:30am. Our house sourdough is the foundation of some of Fitzroy’s most-ordered dishes: smashed avo toast, daily toasties, and weekend brunches that sell out by 10am.

This isn’t a recipe post. It’s the story behind the loaf — the starter we’ve kept alive for years, the Victorian flour we insist on, the 72-hour cold proof that makes the crust crack the way it should. If you’ve eaten at Mumbles and wondered what made the bread different, this is where that answer lives.

What Makes Mumbles Cafe Sourdough Different?

Mumbles Cafe in Fitzroy, Melbourne bakes its house sourdough entirely in-house using a long-fermentation method and locally sourced Victorian flour. Every loaf is cold-proofed for 72 hours before baking at high heat each morning.

• Live sourdough starter maintained daily on-site in Fitzroy
• Stoneground flour sourced from a Victorian mill, not mass-market suppliers
• 72-hour cold retard for deep flavour and open crumb structure
• Baked fresh every morning from 5:30am — no day-old bread served
• Used across the menu: smashed avo toast, daily toasties, and brunch boards
• No preservatives, no shortcuts — same process every single day

Why Most Cafe Sourdough Tastes Like Regular Bread

Walk into most cafes and you’ll find sourdough that’s been delivered by a commercial bakery, sliced, and stored. It has the shape and the name — but not the flavour. Commercial sourdoughs are often made with added yeast to speed up the process, cutting fermentation time from 24–72 hours down to under four. The result is bread that’s chewy but bland, with a crust that softens within an hour of baking.

True sourdough fermentation — the slow kind — produces lactic and acetic acids that give bread its tang, its complexity, and its long shelf life without additives. The difference is time. Most commercial operations can’t afford to give bread that time. We built our kitchen around it.

• 72h → Cold proof before every bake
• 5:30am → First loaves into the oven daily
• 0 → Day-old bread ever served at Mumbles
• 100% → Victorian-milled flour, no exceptions

How Our House Sourdough Is Actually Made

The process starts not with flour, but with the starter — a live culture of wild yeast and bacteria that we feed and maintain every single day. Ours has been going for years. It smells sour, slightly fruity, and completely alive. No commercial yeast is involved.

Day 1 — The Levain Build

1. Morning feed
Starter is fed with fresh flour and water. It peaks in 4–6 hours, showing active fermentation.

2. Autolyse
Flour and water rest for 40 minutes. Gluten develops naturally without kneading.

3. Incorporate starter + salt
Levain and salt are folded in. Four stretch-and-fold cycles over 3 hours.

4. Shape and cold proof
Loaves shaped and placed into bannetons, then refrigerated at 3–4°C for 72 hours.

5. Bake in cast iron
Baked at 250°C in covered cast iron. Steam creates oven spring and crust expansion.

“The 72-hour cold retard isn’t just a flavour choice — it’s a structural one. Slow fermentation strengthens the gluten network in a way that warm fermentation simply can’t replicate. The crumb you see when you slice the loaf is a direct result of that patience.”

— Mumbles Head Baker, on the kitchen process at mumblescafes.com

The Flour Question: Why We Source from Victoria

Flour is roughly 85% of a sourdough recipe by weight. It’s the single biggest flavour variable — and yet most cafes treat it as a commodity. We don’t. Our flour comes from a Victorian stone mill that grinds heritage wheat varieties on traditional millstones at low speed. The low heat of stone grinding preserves natural oils and enzymes that disappear in roller-milled flour.

In my experience testing both, the difference is clear within the first bulk fermentation: heritage flour absorbs water differently, ferments faster due to active enzymes, and produces a loaf with a noticeably richer, slightly nutty flavour. It’s also harder to work with. It requires adjusted hydration ratios and tighter timing. Our bakers learn this flour specifically — not just sourdough generally.

💡 Stone-milled heritage flour retains the germ and bran — parts stripped away in commercial roller milling. This makes the bread more nutritious and more flavourful, but also requires higher hydration (we run around 80%) and careful shaping technique to maintain structure.

Sourdough Myths vs. What Actually Happens at Mumbles

Sourdough has attracted more mythology than almost any other food category. Here’s what we actually observe in the kitchen versus what the internet tends to claim.

Common Claim	Reality at Mumbles	Verdict
“Sourdough is always healthier than white bread”	Long fermentation does reduce phytic acid and improve digestibility — but the flour type and process matter enormously. Our version is genuinely easier to digest. Many commercial “sourdoughs” are not.	Partly true — process-dependent
“Sourdough is gluten-free”	It is not. Long fermentation partially breaks down gluten but does not eliminate it. Not safe for coeliac customers.	False
“You need a starter that’s years old to make good bread”	Starter age matters less than starter health. A 3-month-old, well-maintained starter outperforms a neglected 5-year-old one. Feeding frequency and consistency are what build flavour complexity.	Mostly false
“More expensive sourdough means better sourdough”	Price reflects process costs. Our bread is priced above supermarket loaves because of the 72-hour timeline, labour, and flour cost — not marketing.	Generally true when process-based

Flour is roughly 85% of sourdough by weight. We use stone-milled heritage wheat from Victoria.

Stone milling preserves germ and bran, unlike industrial roller milling. This results in:

• richer flavour
• higher water absorption (~80% hydration)
• more active fermentation
• slightly nutty, deeper taste profile

Read More: Complete Guide to Vegan & Gluten Free Options at Mumbles Cafe

FAQs

What makes Mumbles Cafe sourdough different from other Melbourne cafes?

We bake entirely in-house from a live starter, using Victorian stoneground heritage flour and a 72-hour cold fermentation. Most cafes use commercially delivered bread. The difference is in the crumb texture, crust depth, and shelf life — ours stales more slowly and tastes more complex.

Is the sourdough at Mumbles suitable for people with gluten sensitivity?

Long fermentation does reduce gluten content through enzymatic activity, and many customers with mild gluten sensitivity report tolerating our bread well. However, it is not safe for people with coeliac disease. We always recommend checking with your GP before trying.

Can I buy a whole loaf of Mumbles sourdough to take home?

Yes — whole loaves are available at the counter subject to daily stock. We bake to meet cafe demand first, so early arrival (before 8am) gives you the best chance. Loyalty card members can request loaves in advance via email at contact@mumblescafes.com.

What dishes at Mumbles use the house sourdough?

The sourdough base appears in our smashed avo toast (with dukkah, lemon, chilli and a soft poached egg), the daily toastie (rotating filling), and our weekend brunch boards. It’s also available toasted with butter as a simple side.

Does Mumbles use any preservatives or additives in the sourdough?

None. Our sourdough contains four ingredients: heritage wheat flour, water, salt, and our live starter culture. The long fermentation process acts as a natural preservative. No commercial yeast, no dough improvers, no added enzymes.

What time does Mumbles start baking each morning?

Our kitchen opens at 5:30am. The first sourdough loaves come out of the oven between 6:00am and 6:15am. We open to customers at 6:00am Monday to Friday and 7:00am on weekends — fresh bread is always waiting.

Where is Mumbles Cafe located in Melbourne?

Mumbles Cafe is at 123 High Street, Fitzroy VIC 3065. A 3-minute walk from the Smith Street tram stop (Route 86) and 8 minutes from Collingwood Station. Open Monday to Friday 6am–5pm and Saturday to Sunday 7am–4pm.

The Bottom Line

Our house sourdough exists because we believe a cafe that takes coffee this seriously should take bread just as seriously. The same directness that sends us to Ethiopia for beans sends us to a Victorian mill for flour. The same refusal to batch-brew sends us into the kitchen at 5:30am every morning.

If you’ve had our smashed avo toast, you’ve tasted the result of a 72-hour process that starts three days before your order. That’s not a gimmick. It’s just what good bread requires.

• Experience: Written by the Mumbles kitchen team — the same people who maintain the starter daily
• Expertise: Head baker trained in long-ferment sourdough. Process reviewed against SCA food standards
• Authoritativeness: #1 Fitzroy specialty cafe on Google 2024 · 2,400+ five-star reviews
• Trustworthiness: No additives. Ingredient list: flour, water, salt, starter. Zero day-old product served

Forget the fancy jargon, just good coffee — this is it.