Oscar has always gotten a small sampling of tuna whenever I crack a can.
Until recently, though, it never occured to me to give her the water in which
it's packed.  I drained it into the sink, then gave her a bit of the meat.

Well, due no doubt to something I read here on this NG, today, Oscar received
not only tuna, but a bowl full of tuna water to go with it!  Ladies and
gentlemen, I have never seen such an immediate and hearty response from my
cat.  She stuck her nose right into the bowl, and said nose did not emerge
until I could not distinguish the bowl she'd been licking from the bowls in
the cupboard.  (I put it in the dishwasher, anyway.)

Oscar thanks the group very much for such a sensible and waste-free idea!