Served with buttered bread, it is filling enough for a mid-afternoon meal but light enough to be fully digested by dinner time. It's also vegetarian. Today is a holiday, the girls are home and vegetarian Sam, the soup lover, will like this. What is in the soup? Chickpeas, potatoes and chayote, as the title says. The broth is seasoned with Himalayan black salt and pepper. To garnish, slices of lime, mint leaves and crisp fried onion slices.