Melt butter or margarine in stockpot. Blend in flour and cook on medium heat, stirring frequently until golden brown, 8 to 10 minutes.
Slowly stir in beef stock, onion powder and pepper. Blend well and bring to boil. Reduce heat. Simmer on medium heat, stirring constantly until thickened, 6 to 8 minutes.
Serve over mashed potatoes, noodles, rice, meat or poultry.Servings: 1 gallon