Umami closes after a decadeThe bar at Umami. Photo: The Chronicle 2010 Umami closes after a decadeUmami exterior. Photo: The Chronicle Umami, one of the most popular restaurants in Cow Hollow, is closed. Partner Nate Valentine, who confirmed the news, says that the 10-year-old restaurant closed last night. Sister restaurants Mamacita, Padrecito and Tipsy Pig will remain open. In a statement, the Umami crew shared some thoughts on the closure: “Call us another casualty of a changing San Francisco. To each and every customer, it was both an honor and a pleasure to serve you. To our employees, both now and over all the years, it was an honor and