In a large skillet, cook the sausage over medium heat, breaking up the chunks. Cook until it is completely cooked through. Sprinkle in the flour, stirring it into the sausage.
Pour in the milk and stir. Cook this over medium heat, stirring constantly until it comes to a gentle boil. Let it bubble for one minute and remove from heat.
Add pepper if you like. The gravy will thicken a little more as it cools.
Enjoy as you wish!
Notes
If you use a turkey or beef sausage (which I now do to be biblically clean) you will need to add a little extra fat like butter or ghee. Turkey & beef sausage are normally very lean.