Pot Roast Gravy

Remove roast from pan. Skim fat from pan juices. Add water to juices to make 1 1/2 cups. Put 1/2 cup cold water in jar; add 4 tablespoons flour (Wondra works best); shake well. Stir into juices; cook, stirring constantly, till gravy is bubbly. Season with salt and pepper. Simmer 2 to 3 minutes; stir occasionally. Makes 2 cups.