While not nearly as sweet as bananas, plantains do have a sweet flavor. In this soup we keep that sweetness at bay by using firm plantains with green skins rather than riper brown-skinned ones--the sugars will have not yet developed, so the fruit will add starchy body to the soup without too much sweetness.
What's the secret to its success? Fresh basil and onions mixed with our garlic & herb flavored mayo. Add ham and a slice of sharp Cheddar, and you've got a winner.