This vibrant soup from Rita of Pink Bites is a sight for sore eyes. The bright collard greens swirl in a base of olive oil, water, and potatoes to make a simple, cheap, and filling dish. Collard greens are full of vitamin A and are a good source of zinc. Seriously, I feel healthier just looking at this soup. Portuguese in origin, caldo verde simply means "green broth," and so it is. Add some sausage if you'd like something a bit heartier, but a nub of toasted bread works well too.