Using ingredient lobster butter a little at a time

Tournedos Of Lotte With Lobster& Lobster But

• 18 lotte
• 2 1/2 lobster
• 1 carrot
• 1 bay leaf
• 1 tarragon
• 1 thyme
• 1 celery stalk
• 1 onion
• 1 garlic clove
• 750 gr butter