When you have finished roasting your meat, pour the drippings from the roast into a fat separator. Let the fat rise to the surface and pour the flavorful drippings into the gravy. This will dilute the gravy to the right consistency and add the flavor from the roast to your gravy. If you want the gravy a little looser, gradually add the remainder of your stock.
Season to taste with salt, pepper and any optional ingredients like soy sauce, Worcestershire sauce, fresh herbs and/or cream.