This is an old fashioned recipe that my aunt gave me many years ago, it brings back memories for me.
Oil or bacon grease
2 (or more) cans finely cut tomatoes
Put oil in a pan. Put a heaping tablespoon of flour in hot oil and brown lightly on low heat. Pour 2 or more cans of finely cut tomatoes in the pan. Take a potato masher and mash the tomatoes up. Pour enough water to make gravy. Season with salt and a tablespoon sugar. Cook about 10 to 15 minutes on low heat. This is good with meatloaf.