Cook sausage over medium heat until it is cooked through and browned. Cast iron gives it a nice, crispy texture.
Once sausage is cooked combine milk and flour and whisk together to remove any lumps.
Slowly pour milk/flour mixture into the pan and turn down heat.
Cook over medium heat for 3-4 minutes until gravy thickens, stirring often to prevent burning.
Remove from heat.
Add salt and pepper to taste.
This simple gravy is perfect served over biscuits or as a side dish to eggs.