Pub Grub Beef Tips: Guinness Gravy, Proper Tasty!

Ingredients

• 2 lbs (900g) beef tips (sirloin or chuck), cut into 1-inch (2.5cm) cubes
• 2 tbsp (30ml) olive oil, extra virgin
• 1 large yellow onion, diced
• 2 carrots, peeled and diced
• 2 celery stalks, diced
• 4 cloves garlic, minced
• 1 tbsp (15ml) tomato paste
• 1 tsp (5ml) dried thyme
• 1/2 tsp (2.5ml) dried rosemary
• 1/4 tsp (1.25ml) black pepper, freshly ground
• 1/2 tsp (2.5ml) salt, or more to taste
• 2 tbsp (30ml) all-purpose flour
• 1 (14.9 oz/440 ml) can Guinness stout
• 2 cups (475 ml) beef broth, low sodium
• 1 tbsp (15 ml) Worcestershire sauce
• 1 bay leaf
• Fresh parsley, chopped (optional)
• Sour cream or crème fraîche (optional)