On Wed, 29 Feb 2012 16:46:49 -0800 (PST), marco >
wrote:

> uncovered? why?
> it takes Longer to boil if uncovered
- Boiling with the lid on increases the likelihood of boiling over.

- Boiling with the lid on causes the liquid to boil (and the food to
cook) faster than what may be desirable.

- As others have mentioned, boiling with the lid on prevents
reduction.

There are probably other good culinary reasons for boiling with the
lid (completely or partially) off when you're concerned with more than
just saving time and fuel.

--
Ann's Little Brother Bob