Add carrot, celery and onion; cook and stir until vegetables are lightly browned and tender, 3-5 minutes, scraping brown bits from bottom of roasting pan. Add wine; simmer until reduced slightly ...

"Jus" means, basically, "juice," so "au jus" translates literally as "with ... fond brun, by contrast — brown stock — is richer in both color and flavor and is made by first roasting meat ...