Costco's French onion soup
How To Make Costco's Frozen French Onion Soup Taste Homemade
By Alli Neal
If you don't have the time to make homemade French onion soup, Costco sells a frozen variety, which comes in six individual portions and can be ready in as little as five minutes.
To make it taste more homemade, Laura Manzano of The Kitchn recommends thickening the soup with a cornstarch slurry, adding more cheese, and topping it with toasted bread.
If you’re making all six portions, 1 tablespoon of cornstarch to 1 cup of water will do, and for a single portion, 1/2 teaspoon cornstarch to 2 1/2 tablespoons water will suffice.
Even though the frozen soup comes with its own cheese and bread, Manzano finds them lacking — for instance, the croutons are soggy upon reheating.
Add thick slices of toasted, crusty buttered bread; top the soup with a slice and a generous shower of grated gruyere and parm; and crack some fresh black pepper in there.
To take it even further, you could swap the cornstarch slurry for a butter and flour roux, add alcohol like port or sherry for depth of flavor, or serve with garlic toast.