Karen,

Although soured (sour) cream does indeed come in a semi-solid form, we measure it in fluid ounces in the UK - however, for those of you in the US, it works out to about half a cup.

Re this issue about whether you need to do something to the cream to sour it - no, you don't need to add anything to it, you should be able to buy it already soured (well at least you can in the UK! )


Hope these explanations help