Rock Lobster Tail Recipe : 4 lobsters, each weighing 400g, 1 large onion, 4 carrots, 3 celery sticks, 1 leek, 2 tbsp of tomato puree, 5 tbsp of brandy, 6 sprigs of thyme, 6 sprigs of fresh tarragon, 10g of butter, 2 tbsp of cream, 4 garlic cloves, olive oil, 100ml of double cream, 1 cauliflower, 100g of butter.