Casserole Kacang Hijau

Bahan-bahan (8 porsi)

• 2 pounds green beans
• 2 tablespoons butter
• 1 shallot, thinly sliced
• 2 tablespoons all-purpose flour
• ¼ cup white wine
• 3/4 cup whole milk
• 1 cup vegetable broth
• 2 teaspoons soy sauce
• 1 g arlic clove, grated
• 1/2 cup shredded gruyere
• 1 teaspoon salt
• 1 cup crispy fried onions