Heat about 1/4 cup oil in a large heavy skillet until skillet is medium hot. Lay ham slices in skillet. Cook on one side for 8 minutes over medium high heat. Turn slices of ham and fry 8 minutes more. Pour coffee into skillet with ham slices. Sprinkle with sugar and stir. Cover and let simmer over very low heat for 5 to 10 minutes. Serve ham and red-eye gravy together. 8 to 10 servings.