The All-New Green Bean Casserole

INGREDIENTS

• 1 1/4 lbs. green beans
• Kosher salt and freshly ground pepper
• 2 Tbs. unsalted butter
• 10 oz. button mushrooms, sliced
• 3 large shallots, plus 3 Tbs. minced
• 1/3 cup plus 3 Tbs. all-purpose flour
• 1 cup half-and-half
• 1 cup chicken stock or broth
• 1 tsp. soy sauce, preferably mushroom soy sauce
• Canola oil for deep-frying