This is a wonderfully moist cake with lots of orange flavor, thanks to orange zest, orange juice, and orange marmalade. Don’t be concerned if you do not care for marmalade on its own; it disappears into the cake, leaving no bitterness but adding another layer of flavor. The orange flower water in the glaze is optional, but adds yet one more layer of orange, and a bit of mystery.
Store the cake at room temperature, tightly covered with plastic wrap or foil. It will keep well for several days.