It has been at least 40 years since I had this but I remember really enjoying it as a kid.
The other day they had green plantains at the supermarket so it was the perfect opportunity to try making some.
Saute one finely chopped large onion, about a cup full of finely grated carrot, a table spoon of cumin and three cloves of garlic til nice and soft.
Dice two large green plantains in to small cubes.
Add 5 cups of chicken broth, the diced plantain, three bay leaves and some salt and pepper. Bring to a boil, reduce flame to a simmer, cover and let it cook on low flame for about an hour. After an hour run the whole mess though the blender and adjust salt and pepper to taste.
Serve with a spoon full of sour cream and some chopped cilantro or scallions. Its kind of like squash soup with a slightly different taste and quite a bit easier to make.