When icicles hang by the wall

In these freezing conditions I caught sight of these icicles and William Shakespeare came to mind - I learnt this at school! Do kids still learn poetry at school? I do hope so! Poetry can be very healing - it can touch our souls and speak to the spirit within us and help to heal our wounds.

WHEN icicles hang by the wall
And Dick the shepherd blows his nail,
And Tom bears logs into the hall,
And milk comes frozen home in pail;
When blood is nipt, and ways be foul,
Then nightly sings the staring owl
Tu-whoo!
Tu-whit! tu-whoo! A merry note!
While greasy Joan doth keel the pot.


When all around the wind doth blow,
And coughing drowns the parson's saw,
And birds sit brooding in the snow,
And Marian's nose looks red and raw;
When roasted crabs hiss in the bowl—
Then nightly sings the staring owl
Tu-whoo!
Tu-whit! tu-whoo! A merry note!
While greasy Joan doth keel the pot.

What does "keeling the pot" mean?