Grant Achatz is on a book tour. Last night he was at Omnivore Books in San Francisco. An intimate setting for 40 of us who snapped up tickets to meet Achatz and hear a reading from his book. Omnivore books is a tiny, one room book shop lined with shelves holding an exceptionally curated selection of books about one subject, cooking and food. Any foodie worth his or her sous vide or lobster foam knows by now about Grant Achatz, chef owner of Alinea in Chicago. For those who don’t know, he’s a protoge of Thomas Keller (French Laundry) and Ferran Adria (El Bulli), and has become famous for his innovative take on molecular gastronomy.