In a large skillet brown the sausage over medium heat, breaking up the sausage as it browns. 

Do not drain out the grease, unless there is more than 3 tablespoons. 

Stirring constantly, cook the flour with the sausage for a couple of minutes.

Stir in the milk, scraping up any cooked flour that may be sticking to the bottom of the pan. 

Season generously with salt and lots of pepper.

Stirring occasionally, cook for 10-15 minutes until the mixture has thickened. 

Serve warm over biscuits.