While the vegetables are simmering, make the white sauce. Heat the oil in a medium saucepan. When it is hot add the flour and cook, stirring all the time, for 1 minute. Stir in the milk ...
I grew up on Long Island, New York, where it's called sauce, not gravy (unless you're making it on a Sunday with a heckton of meat) and "cheating" with a jarred formula earns you a whack with a ...