French onion soup is traditionally made with thinly sliced yellow onions. You can also make delicious soup with red or white onions – it just depends on your flavor preferences and what you have on hand.

Transfer the cooled soup to an airtight container, but leave out the croutons (they taste best when they’re fresh). Store it in the fridge for up to three or four days.

To reheat French onion soup, bring it to a boil on the stove. You can add more broiled bread and cheese if you want to go the extra mile, but you can use store-bought croutons for quick and easy results.

– You can easily freeze French onion soup without the croutons: Just transfer the cooled soup to an airtight, freezer-safe container and freeze up to three months. To make things easier on your future self, you can freeze it in serving-size portions – that way, you don’t have to thaw and refreeze the whole batch.

– To thaw frozen French onion soup, simply transfer it to the fridge and allow it to defrost overnight. In a rush? You can thaw it more quickly by submerging the sealed container in cool water