How to cook octopus

Ingredients

• 1 octopus
• 1 onion
• 2 cloves garlic
• 1 carrot
• 1 leek
• 1/2 celery root
• 1/3 oz parsley
• 3 tbsp olive oil
• 1 cup white wine
• 6 cups water
• 1 bay leaf
• sea salt
• pepper