So first off, let me say that even though they look very similar to a banana, their flavor is nothing like one. Like a banana however the longer they ripen the sweeter they will get. I like to use them when the skin on them is about 50% black. You aren't likely to find ripened plantains in a grocery store, so if you want to try this recipe out, you will need to plan ahead. I bought these 1 week in advance of when I was planning on making them.
Pork Tenderloin and Plantains