Gumbo: Louisiana's great stew

Every gumbo begins with someone standing at the stove, stirring flour into hot fat and refusing to look away. The mixture goes from pale to blond, then to the colour of peanut butter, then darker still, until it smells deeply toasty and looks like melted chocolate. Walk off to answer the phone and it can scorch, and a burnt roux, cooks will tell you, means starting again.

That patience is the price of entry to one of the great dishes of the American South, a stew-soup from Louisiana that carries more history per spoonful than almost anything else I can think of.

The roux and the trinity

A roux is simply flour cooked in fat, a French technique used all over the world to thicken sauces. Louisiana cooks take it much further than a classic French kitchen would. The longer a roux cooks, the darker and nuttier it gets, and the less it thickens, so a very dark gumbo roux is there mostly for flavour: a roasted, almost smoky depth that becomes the backbone of the pot.

Into that roux go the vegetables Louisiana calls the holy trinity: onion, celery and green bell pepper, chopped and softened together. It is a local answer to the French mirepoix, which uses carrot where Louisiana uses pepper. Garlic usually joins them, and some cooks jokingly call it the pope.

Then comes stock, the meat or seafood, and a long, slow simmer. Green onions and parsley often go on at the end.

Okra, filé and many hands

A gumbo also needs body, and there are two traditional ways to give it.

• Okra, sliced and cooked down, releases a natural thickness into the broth. The plant came to the Americas from Africa, and the word "gumbo" itself is usually traced to West African words for okra. Enslaved West Africans brought both the vegetable and the know-how to cook it, and their influence on the dish runs deep.
• Filé is made from dried, ground sassafras leaves, an ingredient learned from the Choctaw and other Native peoples of the region. It is stirred in at the very end, or sprinkled on at the table, because boiling it can turn the pot stringy. It adds an earthy, herbal note as well as thickness.

Older cooks often say you use one or the other, never both, though plenty of modern pots ignore the rule.

Add the French roux and the Spanish colonial years that shaped New Orleans, and you have the usual way the story is told: West African, Native American, French and Spanish threads, plus later arrivals, all knotted together in one pot. I find it hard to name a dish that tells the history of a place more honestly.

Creole and Cajun

People in Louisiana will gladly explain that there isn't one gumbo but two great families, with endless variation inside each.

Creole gumbo is rooted in New Orleans, a port city with wide access to ingredients. It often includes tomato, and seafood versions are a classic: shrimp, crab and oysters, sometimes all three.

Cajun gumbo comes from the country to the west, the home of the Cajuns, descendants of French-speaking Acadians who were expelled from what is now eastern Canada in the 18th century and resettled in south Louisiana. Cajun cooks tend to skip tomato and push the roux very dark. The best-known version is chicken and andouille, a smoked pork sausage, though duck and other game have their place too.

The lines blur in practice, and every family's pot is its own argument. There is also gumbo z'herbes, a green gumbo built on a mix of leafy greens, traditionally linked to Lent in New Orleans. It is a reminder that gumbo is a method as much as a recipe.

How to eat it

Gumbo is almost always served with white rice. A scoop goes in the bowl and the gumbo is ladled around it, so every spoonful catches a little of both. Some cooks put the rice on top instead; nobody needs to fight about it.

• Season at the table. A bottle of hot sauce is usually close by, and sometimes a shaker of filé as well.
• Expect a dark, savoury broth, not a thick stew. A good gumbo is often looser than people imagine, rich but spoonable.
• Try it with potato salad. In parts of Cajun country, a scoop of potato salad goes on the side or even right into the bowl. It sounds strange and makes perfect sense once you try the cool and the hot together.
• Have some bread. French bread for the last of the broth is never a bad idea.
• Don't fear leftovers. Like many stews, gumbo is often said to be better the next day, once the flavours have had a night to settle.

If you like the idea of a big communal pot finished at the table, Mexico's pozole will feel like a distant relative. And if the French roots interest you, our piece on French onion soup shows another way that patience at the stove turns humble ingredients deep and brown.

What strikes me most about gumbo is that no single culture could have invented it. It needed African okra, Native filé, a French roux, the crossroads of a Spanish and French colonial port, and generations of cooks who were never asked to write it down. Every bowl is proof that a dish can be bigger than any one of the people who made it.