Remove the roast from the fridge at least 1 hour before cooking. Preheat the smoker to 250 degrees F. Generously season all sides of the roast with the Original seasoning, or substitute.
Place the roast on the smoker and add 1 chunk of cherry wood. Cook for about 1 hour, or until the internal temperature is between 110 and 120 degrees F.
In a deep Dutch oven or large casserole pan, peel and cut one of the onions in half and place in the bottom of the pan. Add 1 box of the beef broth and the worcestershire sauce. Place the roast on top of the onions, placed on the bottom of the pan.
Add the onions, potatoes and bay leaves around the roast. Cut the stick of butter into tablespoons and place on top of the roast and veggies. Cover, and bake Place the potatoes, onions
Cook in a preheated oven to 375 degrees F. for 1 hour, then add the carrots. Continue to cook for about 2 to 2 ½ hours, or until the roast and veggies are fork tender. Be sure that there is enough broth for cooking, and add more if needed.
Remove the veggies and roast from the Dutch oven or pan and place on a large serving tray. Cover and keep warm.
Return to the Dutch oven/pan, add the remaining 1 box of beef broth and bring to a simmer.
Stir in the evaporated milk.
In a small bowl combine the cornstarch and water. Stir the cornstarch mixture into the broth. Continue cooking, stirring frequently, until the mixture thickens to a gravy consistency. Serve warm with the pot roast and veggies.