Cut plantains in half lengthwise, remove skin and then cut into oblong chunks.
Lightly toss slices of very ripe plantain with coconut oil with a little sea salt and cover in a roasting pan with tin foil.
Cook low on 320f degrees for approx. 20 minutes.
Then, remove the cover (the plantains will be a little puffy and very soft), crank up the heat to 420f degrees for 15 minutes or so, watch them and they're done when you're happy with the color! I like mine dark!