Gluten-Free French Onion Soup: Where the Gluten Hides

Bowl of gluten-free French onion soup topped with melted cheese

French onion soup looks simple: onions, broth, bread and cheese. Each of those layers can carry gluten, though, and the classic version picks it up in four places. Fix those four and the soup tastes the same as the one you remember.

The stock is the first place to look

A pot of onion soup is mostly stock, so the carton counts for more than anything else you buy. Plenty of boxed broths and bouillon cubes list yeast extract, which can come from barley, or caramel color and flavorings with no source named. Pick a chicken or vegetable stock that says gluten-free on the package. Homemade stock works too, as long as nothing in it came from a packet.

Give the onions their full time

The flavor of this soup comes from the onions, not from any special ingredient. Slice them thin and cook them in butter or olive oil over medium-low heat, stirring now and then, until they turn a deep golden brown. The gfcooking.food recipe gives this step 25 to 30 minutes. If the onions start to scorch at the edges before the middle softens, turn the heat down and add a splash of water. Rushing this stage on high heat gives you bitter, half-cooked onions, and no amount of cheese covers that up.

Swap the flour, keep the body

Most French onion recipes stir a spoonful of wheat flour into the onions before the stock goes in. That small amount gives the soup a little body so it coats a spoon. A tablespoon of gluten-free all-purpose flour blend does the same job. Sprinkle it over the onions, stir for a minute or two to cook out the raw taste, then whisk in the stock slowly so it stays smooth.

Check the wine

A splash of dry white wine lifts the browned bits off the bottom of the pot. Wine is made from grapes, so it is usually not a gluten worry, but flavored wines and cooking wines can include other ingredients. Read the bottle, or leave the wine out. The soup still works without it.

Make the croutons yourself

The bread is where most restaurant versions go wrong for anyone eating gluten-free. A slice of regular baguette floats on top and soaks up the broth, so there is no picking it off. At home, cut gluten-free bread into one-inch cubes, toss them with a little olive oil, and bake at 375F for 8 to 10 minutes until golden and crisp. Gluten-free bread tends to go soft faster than wheat bread once it is wet, so add the croutons right before serving instead of letting them sit in the bowl.

Finish under the broiler

Grated Gruyere or Swiss on top is optional, but it is what most people picture. Cheese is gluten-free by nature, though pre-shredded bags sometimes add anti-caking agents, so check that label or grate a block yourself. Ladle the soup into oven-safe bowls, top with croutons and cheese, and broil for a minute or two until it bubbles. Watch it the whole time. A broiler goes from melted to burnt fast.

The full ingredient amounts and the step-by-step method are on GF Cooking: get the gluten-free French onion soup recipe here.

Always check ingredient labels yourself, especially on stock, bread and cheese. Formulas change, and the label on the package in your hand is the one to trust. In the US, products labeled gluten-free must contain less than 20 parts per million of gluten under FDA rules.

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