Brown sausage in a large skillet over medium heat, add onions and cook until tender.
When sausage is done cooking, drain into a dish – reserving drippings. Put sausage into a bowl and cover to keep warm.
Place 1/4 sausage drippings or butter into the skillet and add flour, cook and stir over medium heat until roux is formed, and lightly browned. Slowly stir in milk , adding enough to make the consistency you like. Stir in Worcestershire sauce and salt & pepper, and add sausage back in to gravy. Warm through. You can adjust thickeness of gravy by adding more milk if needed.
Serve over your favorite biscuits……enjoy!