Jeff koehler's fish soup from his new cookbook, spain, is based on a classic dish from the island of menorca. Traditionally prepared in a deep cazuela and enriched with saffron and the roe of spiny lobsters, this style of soup is fragrant and truly velvety. Spiny lobsters are hard to find outside of spain and they have a sliver of a short season, so koehler has shared instead a twist on the soup that can be eaten year-round, anywhere in the world.