Cola Beef Roast

I used to make this roast all the time. Lately I end up making one of my other recipes mainly because we don't usually have soda on hand. But this is so good and so easy it has been on our table many many times over the years.

1 (3 to 4 pound) beef roast (any kind)

1 1/2 cups ketchup

1 can cola

Place roast in crock pot. Pour ketchup over meat and then cola. Cover and cook on high 4 to 4 1/2 hours, or low 6 to 8 hours.