You need 1 ingredient. The key ingredients include: ["For the broth:", "1 whole chicken", "¼ cups water", "1 medium onion, root end left intact, peeled and quartered", "5 large cloves garlic, peeled and smashed with the flat side of a knife", "2 medium carrots, halved once lengthwise and once crosswise", "3 celery stalks, cut into about 4"" lengths", "2 bay leaves", "1 1/2 tablespoons kosher salt", "1 tablespoon whole peppercorns, lightly crushed", "1/2 teaspoon whole allspice, lightly crushed", "a few sprigs fresh herbs, whatever you have on hand. I used rosemary, thyme, and sage.", "For the soup:", "2 tablespoons olive oil", "2 cups chopped yellow or white onion", "2 tablespoons minced garlic", "3 celery stalks, trimmed and cut into about 1/4"" sliced", "4 medium carrots, peeled and cut diagonally into about 1/4"" slices", "2 bay leaves", "1/4 teaspoon dried oregano", "14 ounces whole tomatoes in juice", "8 cups homemade broth", "16 ounces frozen butter beans (lima beans)", "3 medium Yukon Gold or other boiling potato, peeled and chopped into 1/2"" pieces", "15 ounces whole kernel corn", "12 ounces shredded or diced chicken from the meat you reserved (about 4 cups)", "1/2 teaspoon kosher salt", "freshly ground pepper"].