Somewhere between September 2023 and September 2024, a thousand Europeans signed up to mail jars of fermenting flour to strangers in labs. Six hundred and seventy-one of them actually followed through. Some samples leaked. Some arrived more acidic than they left. A few exploded in transit.
The result, published recently in npj Science of Food, could probably get listed as a Guinness World Record for being the largest pan-European survey of household sourdough practice ever attempted. The researchers were after microbes. What they got, almost incidentally, was a new kind of map.
Europe has a Wine Belt. It has a Beer Belt, an Olive Oil Line, and a vague but defensible butter vs. lard frontier somewhere in the Alps. It can now add a Sourdough Belt to the list.
The breakdown
The German-speaking countries — Germany, Austria, Switzerland — form one tight cluster. They prefer organic wholemeal flour. They favor rye and spelt. I imagine their starters are old, and probably refreshed to the minute and on schedule. I also imagine these people to bake bread for execution’s sake — with appropriate flour, milled to the appropriate grade, sourced from an appropriate farm with appropriate certifications. Sixty-six percent of bakery participants and sixty percent of household participants reported using organic flour, a figure that would make any North American flour distributor weep into their conventional all-purpose.
Then there is the Mediterranean and Eastern cluster — Italy, Romania, Finland — where participants leaned toward non-organic wheat. This is the finding the researchers had to dance around a bit, because Italy and Finland are countries with bread cultures that border on the sacramental. Italy invented the concept of caring deeply about flour (pasta, pizza, yadda yadda yadda). Finland eats roughly its own body weight in rye annually. And yet, when asked what they actually feed their starters, both countries answered, more or less: regular wheat from the regular store.
The Northwestern bloc — Belgium, Denmark, Sweden, the UK — splits the difference and adds a twist. They blend. Mixed flours, grain combinations, the bread equivalent of a diversified portfolio. These are people who have read about sourdough on the internet and would like you to know they have read about sourdough on the internet.
Cutting into the loaf
The temptation is to read these groupings and the map as a hierarchy of authenticity, with the Germans at the top, doing it ‘right,’ and everyone else trailing behind. This temptation should be resisted, because it gets the story exactly backward.
The German-speaking cluster isn’t more traditional. It’s more legibly traditional, which is a different thing entirely, and a more modern thing than it looks. Organic certification is a 20th-century invention. Vollkorn as a moral category is a 20th-century invention. The artisan bakery as a site of cultural identity, rather than just somewhere you buy bread because you need bread, is largely a postwar phenomenon dressed up in a much older costume. What the data captures isn’t the survival of tradition but the successful conversion of tradition into a neat little consumer category, complete with price premiums and certification logos.
The Italians and Finns, by contrast, are doing what people who actually grew up inside a bread culture tend to do, which is not think about it very much. You don’t perform your relationship to a staple food when the food is genuinely staple. You just eat it. The Finnish rye loaf is mostly purchased, not baked at home, because in Finland rye bread is infrastructure, not a hobby. The Italian wheat starter is fed regular wheat because the question of whether the wheat is artisanal enough is a question that mostly occurs to people who go far out their way to care.
The 671 jars in the lab freezer are mostly evidence of microbiology. But, at least as a thin argument that’s fun to think about, it’s also a small, fermenting archive of who in Europe still feels the need to prove they care about bread, and who has the luxury of not bothering.
You eat what you are. You also, apparently, bake what you’d like to be.