1. Preheat the oven to 300 degrees Fahrenheit.
2. Place the roast in a large baking pan. Then you will need to arrange potatoes, onion, carrots, and celery around the roast.
3. Pour 3 cups of water into the pan. You should also add salt, pepper, and garlic salt to taste on the roast. After that, you can use aluminum foil to cover the pan.
4. Proceed to cook the roast for 3 hours in the preheated oven until the roast is browned and cooked thoroughly.
5. When you put an instant-read thermometer in the thickest section of the roast, it should read 145 degrees F.
6. Then remove the roast and place it on an oven-conducive dish.
7. You can use a slotted spoon to remove the vegetables and place them around the roast.
8. You should lower the oven temperature to 200 degrees Fahrenheit. You can warm the dish with the roast and veggies in the oven.
9. You can pour the remaining baking pan liquids into a saucepan and heat to a boil.
10. Get a bowl and whisk together ½ cup of water and cornstarch until smooth, then pour into boiling pan juices.
11. Now reduce the heat to medium; then cook, stirring frequently, for about 5 minutes until gravy is thick. You can season with salt and pepper. Then add browning sauce just after.

Sauteed mushrooms can be added to your favorite canned or jarred beef gravy. Before serving the gravy, make sure to mix in the juices from the roast. You can serve it to friends or family. Serve with gravy, mashed potatoes, salad, and a vegetable of your choice.

You can watch this video recipe to know how to cook a 3-pound roast and how to use the estimated time efficiently.