Under the glimmering night skies of Portugal, lines of people snake through the streets, waiting for steaming hot bowls of Caldo Verde. This is the nightclub crowd. The night shift crowd. And the I-can’t-sleep-again-because-I’m-thinking-of-him crowd. I was once a part of this group, wearing high heels until they ached. I was much too young to be out so late at night, but there was nothing like sizzling, steaming European street food to keep the evening’s excitement alive, even at four in the morning when all sensible people had retreated under their comforters. But who needs to go to sleep when there is Caldo Verde? Often sold with a steaming hot chorizo stuffed roll (called Pao com Chourico), this hearty soup is considered by some to be the national dish of Portugal. Each bite is a smooth blend of potatoes, garlic, and onion, with shaved kale and sprinkled with chorizo sausage. Compared to fritters and hot dogs, this is gourmet street food. In my excitement to eat the soup, I forgot to add a healthy drizzle of olive oil, …