PREP: 20 minutes COOK: 41⁄2 to 5 hours (low) or 2 to 21⁄2 hours (high) + 10 minutes (high) MAKES 6 servings 4 cups vegetable broth 3 cups frozen shelled sweet soybeans (edamame) 2 medium sweet potatoes, peeled and cut into 1-inch pieces (3 cups) 11⁄2 cups thinly...

























