Plantains just get riper and riper, sweeter and sweeter, until they rot. They should be good and black for this dish, which is great served with vanilla ice cream.
Preheat the oven to 400°F. Don’t peel the plantains, but cut off their ends, then split them in half the long way. Make a few gashes in their flesh. Mix together the sugar, allspice, and cinnamon and push into those gashes. Dot with butter, pushing some of the b