Ingredients

• 2-3 tablespoons olive oil
  
• 2 leeks, white parts only, sliced finely
  
• 1 carrot, finely diced
  
• 1 onion, finely diced
  
• 1 liter stock (beef, vegetable or chicken stock is OK, however beef stock adds richer flavor)
  
• 1 sprig thyme
  
• 1 bay leaf
  
• 2 tablespoons Parmesan cheese, freshly grated
  
• Dash pepper