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What is Open Crumb Bread?

Mary McMahon
Updated May 16, 2024
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Bakers use the term “crumb” to describe the interior consistency of breads and cakes. When a baked good is said to have an open crumb, it means that it is riddled with large, irregular holes, integrating a great deal of air into the dough. Depending on what one wants to do with a finished baked good, a variety of crumbs could be considered desirable, from the rich closed crumb of a brioche to the classic chewy open crumb of ciabatta, a traditional Italian bread. In addition to assessing whether or not a crumb is open or closed, bakers may describe it as moist, crumbly, chewy, or sweet.

Several factors go into the creation of open crumb bread. Open crumb bread has a much higher moisture content than breads with a closed crumb, and it also tends to undergo long fermentation periods. Many breads made with wild yeasts or old dough starters have an open crumb, because they do best when allowed to ferment for an extended period of time. Finally, the dough for open crumb bread is also gently handled during the kneading and shaping process.

The holes in the crumb are caused by bubbles of carbon dioxide, a gas which is emitted by the yeasts in the bread as they digest the flour. As the bread bakes, the gas disperses, but the bubbles remain behind. Many open crumb breads have a very chewy, moist texture, and they tend to be packed with flavor as a result of the long, slow fermentation they were subjected to.

Some of the finest artisan breads in the world are open crumb breads, revealing a lacy pattern of irregularly sized holes when they are sliced open. There are all sorts of exciting things one can do with open crumb bread. For example, such bread lends itself beautifully well to sandwiches, because the bubbles in the bread will trap dressings and sauces, creating a burst of flavor in the mouth. It is also quite enjoyable when spread with butter, cheese, or a vegetable spread, leading many people to take it along on picnics.

Many sourdough breads have an open crumb, along with a dense, chewy crust. If you aren't sure what kind of crumb a loaf of bread has, ask the baker, and he or she should be able to provide you with information. In some bakeries, you may even be allowed to have a taste, so that you can judge the look, feel, texture, and taste of the crumb yourself. When baking at home, a recipe will usually indicate what sort of crumb you should end up with; as a general rule of thumb, commercial yeast and a short fermentation will yield a dense closed crumb bread, while long fermentations and old dough starters or wild yeast starters such as sourdough starter will yield an open crumb bread.

DelightedCooking is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a DelightedCooking researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments
By bear78 — On Feb 17, 2011

@burcidi-- If you want to make open crumb bread, you should use natural wild yeast and knead the dough by hand. I know you said that you don't like to knead and I can't speak for all bread makers, but most will make close crumb bread because their kneading time is very short. It's the kneading that causes the yeast and wheat to combine and make the dough rise. The more you knead, the more bubbles there will be in the bread. Perhaps you can search for a bread maker that kneads the dough for a longer time and more extensively. If you also use a wild yeast for the dough, you can have bread with a less dense texture and big holes. Try making a date and nut bread with these tips, it will be delicious. Best of luck!

By burcidi — On Feb 16, 2011

I love making my own bread and eating it fresh while its still warm, but I am not so great at kneading dough so I use a bread machine. I made banana bread with it last week. I'm pretty happy with my bread maker but the breads always do come out to be closed crumb. I like closed crumb for sandwiches, it keeps the ingredients together, but for dinner and sweet breads like nut bread, I prefer open crumb. Is there a way to make open crumb bread with a bread maker?

Mary McMahon
Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

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