You can cook cranberries in vegtable oil on the stove or put them on a dish that’s going to be baked in an oven. I always put my cranberries in the oven with sweet potatoes, plantain, rasins, and apricots just cover them and let it cook for about 30 min. to an hour in a baking pan, make sure the sweet potatoes and plantain are seasoned with cinnamon and cover everything with oil. Just cover it with aluminum and put it in the oven. Everything will be tender to perfection.