Chayote The vendor told me he puts this in chicken noodle soup. Read on to see what the internet says about it...

Here's a link for some recipes for Chayote: http://www.cdkitchen.com/recipes/cat/691/

When cooked, chayote is usually handled like summer squash, and it is generally lightly cooked to retain the crisp flavor. Raw chayote may be added to salads or salsas, and it is often marinated with lemon or lime juice. It can also be eaten straight, although the bland flavor makes this a dubious endeavor. Whether raw or cooked, chayote is a good source of amino acids and vitamin C. The tubers of the plant are eaten like potatoes and other root vegetables. In addition, the shoots and leaves can be consumed, and they are often used in salads and stir fries, especially in Asia.