Keto Beef and Fennel Casserole - Carb Dodging

Ingredients

• 500 g beef (diced)
• 5 sprigs fresh thyme
• 720 ml beef stock
• 2 tbsp balsamic vinegar
• 2 medium celery sticks (roughly chopped)
• ½ fennel (roughly chopped)
• 1 clove garlic (finely sliced)
• 1 medium white onion (finely diced)
• 1 tbsp extra virgin olive oil
• 1 tbsp tomato puree
• 1 tomato (chopped )