Hamburger Gravy Over Mashed Potatoes

This gravy reminds me of going to my grandma's house as a child. Its yummy and does't take more than 15-20 minutes to cook up. You can also put it over toast, or I guess biscuts if you are are from the South.

INGREDIENTS:
2 pounds lean ground beef
1/4 cup all-purpose flour
1 quart milk
salt and pepper to taste
1 teaspoon onion salt

DIRECTIONS:
1.
Place hamburger in a large, deep skillet. Crumble and cook over medium high heat until evenly brown. Remove from heat and sprinkle flour over cooked hamburger. Stir until evenly coated and all fat is absorbed.
2.
Place skillet over medium heat, add 1/2 of milk and stir until gravy begins to thicken. Add remaining milk until desired consistency has been reached and gravy comes to a boil. Season with salt, pepper and onion salt.
3.
Serve over mashed or boiled potatoes, toast or biscuits. Add fresh chopped onion if desired.