Saute the salt pork on medium heat in the two tablespoons oil until browned and the fat starts to render. Add the onions and cook a minute or two until translucent. Drain the juice of the two cans of beans into the pan with your salt pork, and add the water. Set the beans aside. Simmer about 30 minutes until your salt pork is tender. Add your beans back in along with the sprigs of fresh thyme and cook for an additional 10 minutes on medium. Cooking the pork ahead of time until it is tender flavors your juices and your beans will resemble fresh green beans.