Drain the veggies and juices from the chicken roasting pan in a fat separator and keep the veggies aside. Allow the juices and fat to separate. Strain off the dripping, leaving the fat in the fat separator. For a 3-4 pound chicken you should get at least ¼ cup. Set aside.
In a large skillet over a medium high heat, crush the veggies with a potato masher into smaller bits, adding any bones, wings and additional non edible carcass parts to the pan too.
3-4 cups veggie and bone remnants from roast chicken recipe
Fry the crushed veggies for 5-10 minutes until the color darkens. Add the all purpose flour and coat the veggies with it. Fry for an additional 2-3 minutes until browned and deeper in color.
3-4 tablespoons all purpose flour
Pour the dripping and 2 ¼ cup of water into the pan with the veggies and stir well to combine.
¼ cup chicken dripping, 2 ¼ - 3 cups water
Season with salt and pepper, tasting and adding more as desired. Simmer for at least 20-30 minutes for the deepest flavor and color, or as long as you want, adding more water as needed.
1 teaspoon kosher salt, ¼ teaspoon black pepper
Strain the gravy through a sieve into a clean pan to simmer until it reaches your desired consistency. Serve with your roast dinner.