Lima Beans in Olive Sauce

Name: Lima Beans in Olive Sauce
Ingredients: 1 1/2 pounds dried baby lima beans, rinsed and soaked overnight; 8 cups water; 2 ancho chiles, roasted (see Note) and chopped; I tablespoon grated fresh ginger; 3/4 pound Calamata olives, stoned; 1/2 cup water, or as needed; 2 tablespoons olive oil; 2 large cloves garlic, minced; 10 large scallions, white part only, julienned and left to soak in ice water; 3 ribs celery, strings removed, julienned and left to soak in ice water; 1/2 teaspoon salt; 1/2 teaspoon freshly ground black pepper; Juice of 1/2 lemon