YES.
Gravy is made of the animal fat that you're cooking as the main dish.
(__, Thu 10 Jan 2008, 22:11, archived)

Gravy is made from
Unicorn's spunk
( WormuIus, Thu 10 Jan 2008, 22:12, archived)

Which comes from unicorn meat.
QED.
( BraynDedd Natasha Kaplinsky's labia majora, Thu 10 Jan 2008, 22:13, archived)

Cheese Sauce

( WormuIus, Thu 10 Jan 2008, 22:14, archived)