Lobster Thermidor

INGREDIENTS

• 1 medium (1 1/2 pound) cooked lobster
• 2 tablespoons butter
• 1 shallot, finely chopped
• 1 3/8 cups fresh fish stock
• 1/4 cup white wine
• 1/4 cup double cream
• 1/2 teaspoon hot English mustard
• 1 tablespoon fresh lemon juice
• 2 tablespoons chopped fresh parsley
• salt and freshly ground black pepper to taste
• 1/4 cup freshly grated Parmesan cheese