Arrange banana slices in an 8-inch square baking dish. Sprinkle evenly with orange rind, maple syrup, juice, salt, and spices, drizzle with oil. Bake uncovered at 350 degrees for 45 minutes, basting after 15 minutes with liquid in dish. Serve banana slices hot on wooden sticks. They do not need to be really soft at this point.
Custard is done when a knife can be inserted in the center and comes out clean.
Let soak 1 hour if convenient. If not, bring to a boil, and simmer 2 - 3 minutes. Add 2 T. arrowroot powder or agar-agar. Simmer 2 minutes more. Add 1 Tbsp.