Hearty Beef Casserole

Ingredients

• 1 kg gravy beef
• 1/3 cup plain flour
• ½ tsp salt
• ¼ tsp freshly ground black pepper
• 3 tbsp olive oil
• 1 brown onion, chopped
• 2 sticks celery, thinly sliced
• 2 cloves garlic, minced
• 2 x 400 g cans diced tomatoes
• ½ cup red wine
• 2 cups beef stock
• 1 tsp dried thyme
• 1 ½ cups potatoes, peeled and diced
• 2 carrots, diced
• ½ red capsicum, diced
• 150 g button mushrooms, chopped
• 2 tbsp cornflour
• ¼ cup cold water