Vietnamese spring rolls seem to be hot items in restaurants right now. It’s just too bad that people feel they have to go out and pay several dollars for each spring roll when they can easily make them at home for much less. This recipe is for the traditional spring roll—lettuce, herbs wrapped around pork, and shrimp. Once you get the idea, you can make it your own with chicken, shrimp, tofu—whatever suits you. Though a simple dish, its allure comes from the use of rice paper, or banh trang