Take the 2-minute tour ×
Seasoned Advice is a question and answer site for professional and amateur chefs. It's 100% free, no registration required.

There are numerous chicken stock based soups that also have milk as an ingredient and the milk always seems to curdle - how can I prevent this?

share|improve this question
add comment

5 Answers

up vote 2 down vote accepted

For protection against heat, you can stabalize the milk with starches. (eg, a white sauce made with milk won't curdle, even if you boil it). I unfortunately don't know how much you'd have to add, and of course, it'll end up affecting the texture of your soup).

For soups, you're likely better off making a corn starch/milk slurry before adding the milk, so you don't have to cook it like you would flour to get rid of the raw flour taste.

You may also want to consider the heat that you're cooking the soup at -- you likely want a low simmer, not a full boil.

share|improve this answer
add comment

Milk curdles due to acidity, so if you can raise the pH of the soup by adding something basic, it would help, although it could affect flavor.

The other thing to try is heating the milk to ~90 degrees C before adding it to the soup. This will cause the protein in the milk to change in a way that curdling won't result in as bad a final result--it may in fact appear that the milk hasn't curdled at all.

share|improve this answer
add comment

you can also possibly experiment with creme fraiche, which won't curdle, but the flavor is different (nuttier, but not as sour as sour cream) than milk, but at least you won't have the curdling problem! :)

share|improve this answer
1  
The reason that crème fraiche won't curdle is because it already is curdled! I think this is the same reason that heating the milk (which denatures some of the protein) seems to prevent curdling: because you are in a way pre-curdling it. –  kevins Aug 3 '10 at 13:32
add comment

You might also try using cream instead of milk; I'm not sure I remember the technical reasons but it is much less likely to curdle. You would want to use less of it than the milk, but it won't introduce the possibly unwanted sour flavor of creme fraiche.

share|improve this answer
add comment

Try adding the milk separately to only a single cup of broth. Stir thoroughly. Then slowly add this to the pot. It will allow the milk to come up to temperature gradually in a less acidic environment. Also, higher fat milk will be less likely to curdle, in case when you said milk you meant something other than milk.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.