Billionaire investor Warren Buffett is dipping into the ketchup business as part of $23.3 billion deal to buy the Heinz ketchup company. H.J. Heinz Co. says it’s the largest deal ever in the food industry. The company, based in Pittsburgh, also makes Classico spaghetti sauces, Ore-Ida potatoes and Smart Ones frozen meals. Buffett's Berkshire Hathaway and its partner on the deal—3G Capital, the investment firm that bought Burger King in 2010—say Heinz will remain headquartered in Pittsburgh. Heinz CEO William Johnson said in a statement that the company “will have an opportunity to drive further growth” as a private enterprise....