Place plantains, lime juice, stock and garlic in a large saucepan
over medium-high heat and bring to a boil. Turn heat down and simmer
until plantains are very soft, about 30 mins.
Use a slotted spoon to transfer plantains and garlic to a food processor
or blender and blend, gradually adding broth to make a paste. Pour paste back into saucepan and whisk
over low heat until soup is thickened and heated through. Season with cayenne pepper, salt and pepper as desired.