Jack's Cream Gravy

4 tablespoons pan drippings and browned bits
4 tablespoons flour
1 teaspoon black pepper
2 teaspoons salt
1 cup warm water
13 ounces evaporated milk

Heat fat moderately; stir in flour. Mixture should be thin - not cakey or oily. Cook until medium brown, stirring constantly. Add pepper and salt. Working very quickly, add warm water; stir thoroughly; let bubble. Add evaporated milk. Lower heat and cook to desired thickness, stirring almost constantly. If necessary to thin at this point, add warm water.