When we met one of the owners of Palo Cortao, Ana Hergueta, she was the host one might expect at an upscale eatery in Sevilla, affable as they come. When she heard that we’d like to learn the ins and outs of sherry, she was visibly amplified. Then, when we told her of the Hemingway project as the reason we wanted to learn, Ana was beside herself as a proud fan of his writi