Lobster Bisque I

INGREDIENTS

• 14 ounces raw lobster tail
• 1/3 cup butter, softened
• 7 green onions, chopped
• 1 onion, chopped
• 1 carrot, chopped
• 4 cups fish stock
• 4 sprigs fresh parsley
• 1 bay leaf
• 4 whole black peppercorns
• 2 1/2 cups water
• 1/3 cup all-purpose flour
• 1 3/4 cups tomato puree
• 1 tablespoon sherry
• 1/2 cup heavy cream
• 1 pinch ground nutmeg
• 2 teaspoons chopped fresh tarragon