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Cheese from France, Lyonnais, Beaujolais, Dombes and Bugey

Fromage fort (Lyonnais, Beaujolais and Bugey)fromage fort

Fromage fort is a home ferment of leftover or failed cheeses rather than a cheese made from milk. Old cheese is grated or crushed into a stoneware pot with alcohol, often white wine, and in the Lyon area leek broth; added liquid restarts fermentation. Kept going, it turns pungent and pasty, and the pot is topped up with fresh cheese as it is eaten.

A short entry: the sources we found record only what is said here about Fromage fort itself.

Short entryCheese8 days – 10 days

Recipe

No fixed amounts recordedHome recipes with no fixed amounts; there is no single recipe.
Leftover cheesesGoat, cow or sheep; in the Bugey, Bleu de Gex and grated cheeses[wp-fr]
AlcoholWhite wine, cider, vinegar, or eau-de-vie (plum, grape, marc); the source says every recipe has alcohol[wp-fr]
Leek brothAdded in some regions, notably Rhône-Alpes[wp-fr]
Milk, butter, salt, pepper and wineIn the Ain version of 1928, added after the first fermentation[doane1928]
Startersome Lyon recipes add a levain of fromage fort; the added liquid also sets off a second fermentation

Total time across the recorded steps: 8 days – 10 days

Start
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What changes: Leftover cheeses are grated or crushed into a stoneware pot

Step 1 of 4
Grate or crush old cheese into a pot
Time
Not documented
Temperature
Not documented
Salt
None given
Acidity
Not documented
Flavour
Not documented
Texture
Not documented
Colour
Not documented

Microbes at work in this step

Not documented for this step.

Method

Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source

At a glance

Fromage fort is a home ferment of leftover or failed cheeses rather than a cheese made from milk. Old cheese is grated or crushed into a stoneware pot with alcohol, often white wine, and in the Lyon area leek broth; added liquid restarts fermentation. Kept going, it turns pungent and pasty, and the pot is topped up with fresh cheese as it is eaten. Made in 4 steps over 8 days – 10 days. The longest step, ferment the grated cheese (Ain method), takes 8–10 days (Doane C.F 1928).

Key numbers
Main step8–10 daysReported[doane1928]Ferment the grated cheese (Ain method)

What makes this one different

Fromage fort starts from finished cheese, not milk. Its alcohol and added liquid drive a second fermentation in a pot, and the pot can be kept going by adding more cheese. Cancoillotte, from Franche-Comté, is instead a melted spread made from metton curd.

Related ferments

Variants

  • Fromage fort de la Croix-Rousse (Lyon)Old goat and cow cheese with Gruyère, leek broth, white wine and butter
  • Tracle (Bugey)Bleu de Gex and grated cheeses with white wine and leek broth
  • Cachat and bosson macéré (Provence)Goat or sheep cheese steeped with eau-de-vie

Safety

It is made from leftover cheeses of any kind, and the pot is kept going for weeks or months with fresh cheese added. The CDC tells people at higher risk of listeriosis (pregnant women, newborns, people 65 or older, people with a weak immune system) to avoid any cheese made from raw milk unless it is heated until steaming hot. The leftover cheeses in the pot may include raw-milk ones.

History and sources

Every number is labelled with how it is known. How this atlas is made

In Lyon the Croix-Rousse version took its name from the bouchon restaurants and was above all the cheese of the silk weavers, as an 1841 account describes. A 1928 US bulletin describes the Ain method of fermenting grated, melted skim-milk curd before adding milk, butter and wine.

  1. [doane1928] Doane C.F., Lawson H.W., revised by Matheson K.J. 1928, Varieties of cheese, descriptions and analyses, USDA Bulletin 608 (Fromage Fort)archive
  2. [wp-fr] Wikipédia (fr), Fromage fort (outline only)wiki
  3. [cdc-listeria] CDC, Preventing Listeria Infection (31 January 2025)gov