How Do You Thicken Onion Soup?

You can thicken onion soup by adding a thickening agent like flour or cornflour.

Here’s a detailed guide on how to effectively thicken your onion soup, using information from the provided reference:

Using Flour or Cornflour to Thicken Onion Soup

Method:

1. Prepare a Slurry: In a small bowl, place one tablespoon of either flour or cornflour.
2. Combine with Soup: Gradually add two to three tablespoons of the hot onion soup to the bowl, stirring constantly until the mixture is smooth and free of lumps. This creates a slurry.
3. Incorporate into Soup: Slowly pour the slurry back into the main pot of soup, stirring continuously to ensure it mixes evenly.
4. Simmer the Soup: Bring the soup to a gentle simmer.
5. Cook the Soup: Cook for a few minutes, allowing the starch granules in the flour or cornflour to burst and thicken the soup, while also cooking out any raw flour flavor. The soup should thicken during this process.

Considerations:

• Even Distribution: Ensure the slurry is completely smooth before adding it to the soup; this prevents lumps from forming.
• Simmer, Don't Boil: Avoid bringing the soup to a rolling boil after adding the slurry, as this may lead to the soup thinning out or developing a grainy texture.
• Adjust Quantity: Depending on how thick you want your soup, you might need to adjust the amount of flour or cornflour used. Start with one tablespoon, and if needed, repeat the process with another half or full tablespoon.
• Stir Frequently: Continue stirring the soup while it simmers, to prevent the thickening agent from settling and burning on the bottom of the pot.

Table: Summary of Thickening with Flour/Cornflour

Step	Action	Rationale
1. Prepare Slurry	Combine 1 tbsp flour/cornflour with 2-3 tbsp soup in a small bowl	Ensures a smooth mixture that will integrate into the soup without clumping.
2. Add to Soup	Stir the slurry into the main pot of soup.	Distributes the thickening agent evenly throughout the soup.
3. Simmer and Cook	Simmer the soup for a few minutes, stirring regularly.	Allows starch to activate and thicken the soup while cooking out raw flour flavor.

Following these steps will help you thicken your onion soup to your desired consistency while retaining its delicious flavor.