Preheat the Oven: Preheat your oven to 325°F (165°C).

Prepare the Roast: Pat the 3 lbs sirloin roast dry with paper towels. Season all sides generously with 2 tsp of salt and 1 tsp of black pepper.

Sear the Roast: In a large Dutch oven or heavy-bottomed pot, heat 3 tbsp of olive oil over medium-high heat.

Sear the seasoned roast on all sides until deeply browned, about 3-4 minutes per side. Remove the roast and set aside.

Sauté Aromatics and Create Sauce: In the same pot, add the roughly chopped onions and cook for about 5 minutes until softened. Add 2 tsp of minced garlic and cook for 1 minute until fragrant. Stir in 2 tbsp of balsamic vinegar, 1½ tbsp of tomato paste, and ¼ cup of flour. Cook for 2 minutes, stirring constantly to create a roux. Slowly pour in 2 cups of dry red wine, scraping up any browned bits from the bottom of the pot. Add 2 cups of beef broth, 2 cups of water, 1 bay leaf, ½ tsp of dried thyme, and 1½ tsp of sugar. Stir well to combine.

Braise the Roast: Return the seared roast to the pot, nestling it into the sauce. Cover the pot with a lid and transfer it to the preheated oven. Braise for 2 hours.

Add Vegetables: Last hour of braising, add the roughly chopped carrots, celery, and 1 lb of baby Yukon Gold potatoes to the pot. Cover and continue to braise for an additional 1 to 1½ hours, or until the roast is fork-tender and the vegetables are cooked through.

Finish and Serve: Carefully remove the pot from the oven. Discard the bay leaf.

Transfer the roast to a cutting board and let it rest for 10 minutes before slicing. Serve the sliced roast with the braised vegetables and sauce from the pot. Optionally, garnish with fresh chopped parsley for added freshness and color.

Enjoy: Serve hot and enjoy this delicious oven-braised sirloin tip roast with your favorite sides!