Broccoli cheddar soup

[Mary L Merc]

Why did my broccoli cheddar soup curdle?

[country_boy]

Not sure if this is right, but my mate made some once and he's the biz at it - was stilton not cheddar tho...  I remember he said you gotta keep stirring all the time after adding the cheese else it'll curdle.

[zgma]

I add the cheese at the end, after I've taken the soup off the heat, and just stir it in until it melts

[woofgang]

two reasons that it might have curdled. One is like zgma implies, that you over heated it, the other is that there was an acid ingredient (wine, vinegar, lemon juice) and there was too much in or it wasnt completely stirred in before you added the cheese. Often (but not always) the judicious addition of a little cornflour stirred into water to a thick liquid then stirred in and heated  to a gentle roll can rescue the dish