Homemade gravy

My Aunt gave me my grandmothers old cookbooks. 1 of the cookbooks is Quick Dishes for the woman in a hurry. In the cookbook it is called medium white sauce.

Ingredients:

• 2 tablespoons of butter or margarine (shortening works fine too)
• 2 tablespoons of all-purpose flour
• 1/4 teaspoon of salt
• few grains pepper (I like a lot of black pepper in mine)
• 1 cup of milk (water is a great substitute that I normally use)

1.  Melt butter or margarine in a saucepan over low heat.
2. Blend in flour, salt, and pepper.
3. Heat until mixture bubbles.
4. Remove from heat and add milk (water) gradually.
5. Cook rapidly, stirring constantly, until sauce thickens. (If it because too thick, add a little bit more water)
6. Use for gravies and creamed mixtures. 
7.