Before starting, it’s crucial to let the roast come to room temperature to ensure even cooking.

1. Preheat oven to 325°F (163°C).

2. Season the Beef: In a small bowl, combine the garlic powder, salt, pepper, ground sage, dried sage, and dried oregano. Rub the mixture all over the beef sirloin roast. 

3. Sear the Beef: Heat 2 tablespoons of vegetable oil in a hot skillet or dutch oven over medium-high heat. Once hot, add the beef sirloin roast and sear each side for about 2-3 minutes, until browned. Add the onion halves to the pan for extra flavor.

4. Transfer to Roasting Pan: After searing, transfer the beef and onions to a roasting pan or keep them in the dutch oven.

5. Prepare the Sauce: In a small bowl, mix 1 cup of water with 2 teaspoons of Worcestershire sauce and ½ teaspoon of dried sage. Pour this mixture over the beef.

6. Roast in the Oven: Place the roast in the preheated oven and cook until the internal temperature reaches 135°F (57°C) for medium-rare or 160°F (71°C) for well-done. For a 4 lbs beef sirloin roast, this will take about 20-30 minutes per pound, so plan for roughly 1.5 to 2 hours.

7. Let the Roast Rest: Once the roast has reached the desired internal temperature, remove it from the oven and loosely cover it with aluminum foil. Let the roast rest for at least 15 minutes to allow the juices to redistribute.

8. Serve: Slice the roast and serve with your favorite sides, such as mashed potatoes, green beans, or roasted vegetables. Don’t forget to drizzle some of the pan juices over the meat for extra flavor!

Slow Cooker Instructions

1. For the slow cooker version of this recipe, start by seasoning the beef sirloin roast with garlic powder, salt, pepper, sage, oregano, and flour.
2. Heat some vegetable oil in a skillet over medium-high heat and sear the roast on all sides until browned. After searing, transfer the roast to the slow cooker.
3. Add the onion halves, then pour a mixture of water, Worcestershire sauce, and dried sage over the roast.
4. Cook on low for 8-10 hours, or on high for 4-6 hours, until the meat is tender. Once done, let the roast rest before slicing and serving.

Instant Pot/Pressure Cooker Instructions

1. For the Instant Pot version, season the beef sirloin roast with garlic powder, salt, pepper, sage, oregano, and flour.
2. Set the Instant Pot to the sauté function and add vegetable oil. Once hot, sear the roast on all sides until browned. After searing, turn off the sauté function and add the onion halves.
3. Pour a mixture of water, Worcestershire sauce, and dried sage over the roast.
4. Seal the lid and cook on high pressure for 70-80 minutes, depending on the size of the roast. Let the pressure release naturally before opening.
5. Rest the roast for a few minutes before slicing and serving.

• Grilled Beef Roast: You can grill your roast beef over indirect heat for a smoky flavor. Sear the roast on all sides, then move it to a cooler part of the grill to cook slowly until it reaches your desired doneness.

• Stovetop Pot Roast: Instead of the oven, cook the roast beef in a Dutch oven on the stovetop. Sear the beef, then add beef broth or red wine to braise the meat. Simmer on low heat for a few hours until the meat is tender.

How to Make a Gravy from the Drippings

After cooking roast beef, the drippings left in the pan are perfect for making a rich and flavorful gravy. Here’s how to turn those drippings into a delicious sauce to accompany your meal.

1. Once you’ve finished making roast beef, transfer the roast to a plate and allow it to rest. While the roast rests, place the roasting pan with the drippings on the stovetop over medium heat.

2. Melt butter (about 2 tablespoons) in the pan, stirring it into the drippings. This adds richness and helps thicken the gravy.

3. To the mixture, add 2 tablespoons of flour and whisk continuously for about 1-2 minutes until it forms a roux. This will help thicken the gravy.

4. Slowly pour in more beef broth or enough beef stock (about 1 to 1 ½ cups), whisking constantly to avoid lumps. The amount of liquid depends on how thick or thin you want your gravy. Keep stirring until the gravy begins to thicken.

5. Let the gravy simmer for a few minutes, stirring occasionally, until it reaches your desired consistency. Taste and season with salt and pepper as needed.

This easy method of using the drippings ensures that all the flavors from cooking roast beef go into the gravy, making it a perfect complement to the dish.