Many of us look for BPA-free cans when buying beans, soups and vegetables. But when it comes to tomatoes, even BPA-free cans can still have a chemical lining, since tomatoes are so acidic. When shopping for tomatoes, look beyond cans and for packaging called Tetra Pak. They are cardboard containers that are BPA-free and recyclable. And when you can't find Tetra Paks, look for good old-fashioned glass jars; most health food stores carry tomatoes in glass jars.