How do Crispbread manufacturers use so few ingredients?

I'm curious if anyone is familiar with how the major Swedish crispbread manufacturers like Ryvita, Wasa, Finn Crisp, etc., manage to produce those crackers with ingredients lists as short as "rye flour, salt" – with, perhaps, water and in the less traditional varieties, yeast, thrown in – whereas every crispbread recipe I've seen involves an additional combination of yeast, butter, honey, etc.
I hope this isn't veering into recipe request territory – my apologies if so.
For reference:
Best Answer
All crisp-bread recipes use water (or at least some ingredient with a high water content), but the bread is baked and then hung from the ceiling to dry further until the water content is very much reduced.
The real mystery is how structure is introduced without leavening. Wikipedia has good information on this point,
[...] bubbles are introduced into the dough mechanically. Traditionally, this was done by mixing snow or powdered ice into the dough, which then evaporated during baking. Today, the dough, which must contain a large amount of water, is cooled and mixed until bubbly.
Another method is to knead the dough under pressure in an extruder. The sudden drop in pressure then causes water to evaporate, creating bubbles in the dough.
Presumably knäckebröd was only made during the winter months before its production became industrialised. For the modern home cook, the difficulty of introducing structure still remains, so it is unsurprising that you didn't find many recipes with very basic ingredients.
Some recipes for home cooks introduce structure in the form of seeds and whole grains. Others, as you noted use yeast.
Some Swedish crisp breads such as tunnbröd, have no leavening, no gas incorporated into the dough and are wafer thin. These can be made at home with a very short ingredient list, no specialised equipment and during any season :-)
At least some of the major Swedish manufacturers do use yeast. My favorite, Leksands knäcke, for instance uses,
swedish wholegrain rye flour, fresh water from our own spring, yeast and a pinch of salt.
So if you are considering baking your own knäcke, you don't necessarily have to avoid recipes using yeast.
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How are crispbreads made?
In the case of unleavened crispbread, bubbles are introduced into the dough mechanically. Traditionally, this was done by mixing snow or powdered ice into the dough, which then evaporated during baking. Today, the dough, which must contain a large amount of water, is cooled and mixed until bubbly.Is crispbread healthier than bread?
With 110 calories per crispbread and 14 grams of carbs, you are better off with some slices of standard whole grain bread.How is Wasa crispbread made?
Crispbread has been eaten for about 1,500 years in Sweden and Finland. These crackers are traditionally made from whole meal rye flour, water and salt. The dough does not rise much and the therefore does not become as soft as bread. Crispbreads are baked flatter and more dry, and therefore, keep fresh for a long time.How are ryvita made?
The rye is milled using large grinding rollers. The rye flour is sieved in the milling process to separate the flour, middlings and bran. The dough sheet is made ready for baking into Crunchy Rye Bread. It's cut into slices and there you have it \u2013 crunchy rye breads!How To Make Homemade Delicious Crispbread - Knækbrød
More answers regarding how do Crispbread manufacturers use so few ingredients?
Answer 2
A sourdough would incorporate air without having to purposefully add yeast. I soak my grain overnight, put it in a blender, and then let it sit another day before spreading it out and baking. This does seem to result in a stretchier cracker...
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