Place over medium high heat and cook, stirring and scraping the pan to loosen any particles clinging to the roasting pan.

Pour in the wine, scraping and stirring to dissolve any particles clinging to the pan.

Pour off the fat and add the vinegar, stirring to dissolve the brown particles clinging to the skillet.

Sprinkle the bottom of the pan with the flour (the more used the thicker the gravy), and whisk it vigorously, scraping up any particles clinging to the pan.

No witnesses to the accident had been found, but the post-mortem report, plus laboratory examination of various particles clinging to the tires and fender of the stolen car, had satisfied everybody as to what had happened.