This is a story about espuma: Only the finest cafeterias can coax the perfect amount of sweet bronze effervescence from the humble combination of sugar and first-brewed Cuban coffee. At Las Olas Café, the ladies working the window conjure the fluffy magic with a steady stream of espresso. "¿Que quieres, papi?" one asks as you step up with a fistful of bills. You order a colada, but she's already on it. She was working on it when you entered the cola. The clinking of a weathered spoon stirring coffee and sugar lets you know your time is drawing near. A few moments later, you're clutching that palm-size Styrofoam cup. But first, a personal moment. You peel the plastic top off to find a thin film of this sweet, startling espumita clinging to the surface. Take a lick and find your happy place.