saying grace...

Anas bin Malik (May Allah be pleased with him) reported:
The Messenger of Allah (Sall-Allahu alayhi wa sallam) said,

"ALLAH, Subhanahu wa ta'ala,
will be pleased with His slave
who praises Him
(i.e., says Al-hamdu lillah)
when he eats
and praises Him when he drinks".

[Muslim].