Add the meat, potatoes, onion, garlic, and butter to a large pan or skillet. Cook all together on medium-low heat until the meat is browned and the potatoes are barely fork-tender, but not falling apart. This will take about 10-15 minutes.
1 lb ground venison, 1.5 lbs potatoes, peeled and diced small, 1 onion, diced small, 2 cloves garlic, minced or grated finely, 3 Tbl butter
Next, add the spices and red wine vinegar. Stir to incorporate and allow to cook for 2-3 more minutes.
1 ½ teaspoon kosher salt, ¼ teaspoon pepper, ½ teaspoon dried tarragon, 1 teaspoon dried oregano, 1 Tbl red wine vinegar
Add the flour, and stir so all the filling is coated. Then gradually add the beef broth in small increments, stirring between additions to thicken the filling. Once all the broth is incorporated, take it off the heat and cover. Set aside to cool slightly before you assemble. You don't want it to be piping hot when you put the pie crust on top.
¼ cup flour, 1 ½ cups beef broth