Anything which is a great source of wealth or yields a large income or return.
The point at which two mother lodes intersect.
A rich mine or vein of silver or gold.
Extra benefit.
Unearned gain.
Sauce used for pasta.
A dark savoury sauce prepared from stock and usually meat juices; brown gravy.
Curry sauce.
A pale sauce prepared from a roux with meat fat; a type of béchamel sauce.
To make gravy.