For coffee en plein air, check out Andrea Spella's cart at the Alder Street cart pod. Spella roasts his own espresso beans, using a slightly darker formulation than the popular light roasts prized by Stumptown and others. It doesn't produce the strikingly unique flavors of some light-roasted coffee, but it creates round, rich, sweet espresso with beautiful crema. Drinking Spella's coffee is always a full-body experience: standing, sipping your Americano in the midday crush, among people and the commingling smells from the United Nations of neighboring food carts, with fresh air and sweetness at the back of your throat. If that's not addictive, I don't know what is.