Snow crab with garlic and herbs butter - Le Coup de Grâce

Ingredients

• 1/2 cup half-salted butter, softened
• 2 tablespoons finely chopped fresh thyme
• 2 tablespoons finely chopped fresh parsley + a little for the service
• 3 cloves garlic, finely chopped
• 2 tablespoons white wine
• Salt and pepper from the mill
• 4 large crushed garlic cloves
• 2 cups white wine
• 3 celery stalks, cut into large pieces
• 1 yellow onion, cut into large pieces
• 1/4 cup salt
• 2 tablespoons peppercorns
• 4 large snow crabs, prepared
• Lemon wedges