lid on/off?

[pjgriffo]

Some recipes for e.g. soups, jams etc. say boil/simmer with the lid on , others will say with the lid off the pot, and some will have a bit of both.
What is the reasoning or does it matter?

[pug100]

Hi,
putting a lid on a saucepan will retain heat so you don't need to use as much energy to cook and retain moisture which may be important depending on the recipie.

[cruella]

IF you have the lid off, it reduces the qauntity normally, especially if it is stock etc.

[pjgriffo]

thanks folks.