Jacques Pépin's Shrimp Gratin

INGREDIENTS

• 1/4 cup dry white wine
• 1/2 cup parmesan cheese, grated
• 2 garlic cloves, minced
• kosher salt and fresh ground white pepper
• 4 tablespoons unsalted butter
• 1 pound raw shrimp, size 26-30 is great, peeled and deveined
• 2 green onions, chopped
• 3/4 scant cups bread crumbs
• 1 cup white or cremini mushrooms, wiped of dirt and julienned