The Ultimate Homemade Green Bean Casserole

Name: The Ultimate Homemade Green Bean Casserole
Prep time: 10 min
Cook time: 90 min
Total time: 100 min
Yield: 12
Ingredients: 1 pound (450g) shallots, peeled and sliced 1/8 inch thick on a mandoline; 2 cups (480ml) canola oil; Kosher salt; 1 1/2 pounds (675g) white button mushrooms, rinsed and spun dry in a salad spinner; 2 teaspoons (10ml) soy sauce; 2 teaspoons (10ml) lemon juice from 1 lemon; 2 cups (480ml) low-sodium store-bought or homemade chicken stock; 1 1/2 cups (360ml) heavy cream; 2 tablespoons (30g) butter; 2 cloves garlic, finely minced or grated on a Microplane grater; 1/4 cup (30g) flour; Freshly ground black pepper; 2 pounds (900g) green beans, ends trimmed, cut into 2-inch segments