My Slow Cooker Roast Beef that Serves a Crowd

Ingredients

• 3-4 lb (1.4-1.8 kg) Beef Roast (Chuck Roast or Round Roast recommended)
• 1 tbsp (15 ml) Olive Oil
• 1 large Onion, chopped (approx. 200g)
• 2 Carrots, chopped (approx. 150g)
• 2 Celery Stalks, chopped (approx. 100g)
• 3 cloves Garlic, minced (approx. 10g)
• 1 tsp (5 ml) Dried Thyme
• 1 tsp (5 ml) Dried Rosemary
• 1 tsp (5 ml) Dried Oregano
• 1 bay leaf
• 1 tsp (6g) Salt
• 1/2 tsp (3g) Black Pepper
• 1 cup (240 ml) Beef Broth
• 1 cup (240 ml) Dry Red Wine (optional)
• 2 tbsp (30g) Cornstarch (or arrowroot for gluten-free)
• 2 tbsp (30 ml) Cold Water