Just wondering if it's possible to use a substitute for sour cream in a recipe? I know plain yoghurt has a similar taste, but I haven't used it to make sauces before. Sometimes I use normal cream or evaporated milk instead, but I guess it doesn't give the same flavour. The problem is, every time I cook with sour cream, it seems to give a 'curdled' look to the dish. Any advice would be appreciated..