Bread in Bread: The European Tradition of Baking Old Loaves Into New

Unless you’re a cottage baker baking to order, or have a production capability limited by time or space, every bakery ends up with bread that didn't sell at some point. Croutons, breadcrumbs, maybe a bread pudding if we're feeling ambitious - these are our typical responses to leftover bread. But there's an older, arguably stranger, yet more elegant answer that's been standard practice across Europe for generations, and you just don’t see it that often on this side of the Atlantic.

Bakers soak that old bread, add it into a new dough, and bake it into a fresh loaf.

It came up recently during one of our Bakers Club Bakealongs...
James was talking with members who hesitate to try something new for fear of ending up with a stack of not-quite-right loaves. His point was that even a failed loaf isn't wasted. Worst case, you've got those ‘second life’ options. Best case, you've got an ‘old bread soaker’, to work into your next dough. One of our long-time members confirmed that her favorite rye recipe calls for exactly that - just 25g of old rye soaker. It's a tiny detail in her recipe, easy to skip past. But it's actually a doorway into a genuinely fascinating piece of baking history, one with its own vocabulary, regulations and, in some cases, machinery. What’s more, there’s a clear but scantly evidenced paper trail into American rye bread. We went down the research rabbit hole so you don't have to. (Although we’d love to compare notes if you can’t resist!)

The vocabulary of "bread in bread"

The technique goes by different names depending on where you are, and the lack of a single catchy English term may well be part of why it never became that popular here the way it did in Europe. It's hard to codify something you don't have a word for.

In Germany, unsold or leftover bread is called Altbrot, old bread. Once it's prepared and worked into a new dough, it becomes a Brühstück if it's scalded with boiling water, a Kochstück if it's actually cooked, or a Quellstück if it's simply left to soak and swell. German baking vocabulary makes a real distinction between these prep methods. If a similar distinction exists in English, we haven't been able to find it. 

In Ashkenazi Jewish baking, the same idea shows up as altus, from the Yiddish and German alte brot. It's the term George Greenstein used in Secrets of a Jewish Baker. Same with Jeffrey Hamelman in his landmark book Bread: A Baker's Book of Techniques and Recipes. Zingerman's Bakehouse in Ann Arbor calls their version simply "Old."

You could be forgiven for assuming that the French, with their rich bread culture, would have an equivalent term. Interestingly, that's not the case. They do, of course, have pain rassis, but that just means stale bread, and besides pain perdu (or French toast, to you and me), their usage leans toward chapelure, breadcrumbs used mostly for coating and topping, rather than a soaker hidden inside the loaf. That’s not to say they don’t use chapelure in bread at all, but we’ll come back to that later.

It's not just about waste

So why go to the trouble of soaking old bread and working it back into new dough, rather than just tossing it or repurposing it as croutons, breadcrumbs and crackers? There are four real reasons, and waste reduction is only the most obvious one.

Waste reduction. This is the headline reason everywhere the practice is documented, and the scale involved is genuinely startling. In Austria, unsold bread runs an estimated 20 to 25 percent of everything a bakery produces in a day. Germany doesn't have a formal national survey, but industry estimates put daily unsold goods around 10 percent. When the EU tightened rules on feeding kitchen waste to animals in the mid 2000s, old bread was specifically carved out as an exemption, which speaks perhaps to how established the practice already was. All these stats are given from the perspective of a collective food waste problem, but let’s not ignore that wherever there is poverty, avoiding waste is also an instinctive survival strategy. 

Flavor. Here's the part that James homed in on during the Bakealong. When bread bakes, the crust develops deep, complex Maillard and caramelization flavors. Grind that crust up and work it into a new dough, and you're redistributing one loaf’s deepest flavor notes forward through the entire next one.

Moisture and shelf life. Soaked bread, as with all soakers, acts like a water reservoir inside the dough, and its effects are threefold: it keeps whole grain loaves from crumbling, softens the crumb, and extends how long the finished bread stays fresh.

Economics. Together, the extra water absorbed into the soaked bread and the flour it displaces add up to an increased dough yield, and a tangible cost saving: more loaves from less flour, at any scale. Note: German regulation caps how far you can take this: the old bread itself, weighed before soaking, can make up to 20 percent of the flour used in a formula.

How big is this, really?

Both chapelure and old bread soakers are living examples of bread in bread: old bread (ground and left dry, or ground and turned into a soaker) worked back into a new loaf - cutting waste, adding flavor and moisture, and increasing yield and shelf life. 

The UK has a clear, at-scale example of the soaker version instead. Gail's bakery chain grinds leftover loaves into a porridge and soaks it back into their Waste-Less Sourdough - one trade report puts the surplus bread content at roughly a third of the loaf.

France, meanwhile, has taken to the dry version at real commercial scale. Purpose built machines grind day-old bread into chapelure, a flour substitute rather than a soaked addition. Celebrity pastry chef Christophe Michalak grinds and toasts unsold bread into his Pain Malin, now his Paris bakery's best selling loaf. Guillaume and Gwendoline Le Doze, who run a bakery in Brittany, replace 30 percent of the flour in every specialty bread they make with it.

But evidence of old bread soakers in modern, artisan bakeries in France has proven trickier to dig up. We are convinced it's happening though. If you know a French bakery doing it, or if you're doing it as a result of a family tradition handed down over generations, please let us know!

The trail through American rye bread

One of the things we noticed while researching this whole topic was the presence of rye throughout our findings. But why? It turns out the story of ‘bread in bread’ has a very specific paper trail.

Rye has been part of northern European baking since roughly 1000 BCE, and it became central to Ashkenazi Jewish baking specifically because rye tolerated the cold, wet climates where wheat struggled. Bakers used altus, old bread, deliberately "to add color, moistness and a deeper flavor." When Jewish immigrants brought their rye baking traditions to the United States starting in the mid 1800s, they brought the technique with them. Zingerman's Bakehouse still uses it in a rye sour that dates back to 1992.

We can't say for certain why, but the best documented historical trail, the Ashkenazi tradition, Hamelman's pumpernickel, the named regional formulas at The Rye Baker, runs specifically through rye. Whether that's because rye (the grain itself) or rye bread is especially suited to a soaker, or because the same communities who lean hardest on rye also happen to have strong bread-reuse traditions generally, is uncertain. Or is this just a case of something being handed down, without context, becoming ‘lore’? Our research led us to a passionate, young hobby baker in Luxembourg running a non-specific ‘old bread soaker’ in a formula that's mostly wheat, with only a small amount of rye and spelt alongside it. So maybe rye had the head start, historically, but the technique itself doesn't need it. If you've got a rye-less soaker working in a rye-less loaf, or a theory about why rye and altus seem to travel together, we'd love to hear it. 

One thing is certain, and that’s the paper trail to today. Hamelman's Bread includes a formula called Horst Bandel's Black Pumpernickel, built around an old bread soaker, and it's the single most cited source that carried altus into the American artisan and home baking world. There's a remarkable story behind that recipe's name too - you’ll either have to read the book, or hang tight for news of something rather special soon. 

Here's an interesting gap, though. In Europe, the tradition remains - with commercial infrastructure: regulated, industrialized, sold as equipment. Not so in the US and Canada where its place is a written, cited, home baker and cookbook tradition instead, not something a commercial bakery runs as daily practice on its own unsold bread. We looked. We couldn't find one. If you know of a commercial bakery in the US or Canada actually doing this on the daily, please tell us. 

Where this goes next

We're not done with this one. This month's First Friday Bread Talk (9/4 for Bakers Club members) digs even deeper, and James will be sharing progress and results from his own testing towards building an original old bread recipe. 

In the meantime, if you want to experiment yourself: next time you've got a heel or two of past-best sourdough sitting around, don't reach for the bin. Soak and mash it, or toast and crumb it, and work a small amount into your next dough. That's the tradition, after all: nothing wasted, just your last loaf’s best moments baked into a new one.