Preheat the oven to 325 degrees F (165 degrees C).
Heat the oil in a large oven-safe pot or Dutch oven over medium-high heat. Add the venison roast and brown on all sides, about 5 minutes per side.
Remove the roast from the pot and set aside. Add the onion and garlic to the pot and cook, stirring occasionally, until the onion is softened, about 5 minutes.
Add the beef broth, red wine, Worcestershire sauce, thyme, and bay leaves. Return the roast to the pot and bring to a simmer. Cover the pot with a lid and transfer to the preheated oven.
Bake in the preheated oven for 2 1/2 hours, or until the roast is very tender.
Remove the roast from the pot and set aside. Place the pot over medium-high heat and bring the liquid to a simmer.
In a small bowl, whisk together the cornstarch and cold water to make a paste. Slowly whisk the paste into the simmering liquid and cook, stirring constantly, until the gravy is thickened, about 5 minutes.
Slice the roast and serve with the gravy.
Interesting Facts
Venison is the meat from any species of deer.
Venison is a lean meat and should be cooked slowly to ensure tenderness.
Leftover venison pot roast makes a delicious sandwich when served on crusty bread.