Bisque de homard - lobster soup

Ingredients

• 1,5 kg lobster (we used fresh ones, but you can also use frozen lobster)
• 1/2 leek
• salt to taste
• 4 bay leaves
• about 10 peppercorns
• 3 onions
• 3 celery stalks
• 2 carrots
• 120 ml olive oil
• 2 tablespoons tomato paste
• 120 grams all-purpose flour
• 120 ml Brandy
• 1/2 liter (cheap) dry white wine
• 2 liters fish stock (store-bought or make your own)
• a few sprigs of thyme
• 250 ml cream
• cayenne pepper to taste