This is my mom's recipe. It has a spicy, hearty flavor, yet it is not heavy. It's also full of vegetables, which can be varied by adding carrots or potatoes, but the corn is essential. If available, try using Mexican zucchini, which is pale green and smaller than regualr zucchini. Also, the pasilla chilies cannot be substituted, as the flavor would change entirely. It is always served with lime wedges, chopped onion and a side of arroz blanco (such as Recipe #130916) and it is your choice to add it into the bowl of soup or not. We usually ate all the soup first and left the corn to the end, adding more lime juice and salt to it.