No-waste lobster bisque

Ingredients

• 2 lobsters (cooked and drained (save the meat))
• 1,5 liters fish broth
• 1 leek
• 2 stems celery
• 1 carrot
• 2 onion
• 2 cloves garlic
• 1 tin tomato puree
• 1 dash cognac
• 1 tl cayenne pepper
• sea salt
• black pepper
• 100 ml olive oil
• butter
• flour