I typically like to stay away from canned goods and opt for fresh ingredients. Canned goods can contain BPA, and the food loses a lot of the healthy bacteria during the canning process. However, canned goods can be a lifesaver, and they are ultimately still healthy. I always recommend looking for BPA-free canned goods. If you really want to avoid canned goods, you can use fresh sweet potatoes. However, it will take much longer to use. What you'll need to do is bake a sweet potato (or two, depending on size), then scoop out the insides and add to a blender. Blend until silky smooth and place in the fridge to chill completely before adding to the ice cream mix.