Notes: The purpose of this step is to remove the bitterness from the white part of the rind. Shortcut: Boil 40 minutes without draining, keeping an eye on water level. Changing the water makes the cake flavor a bit cleaner because you're discarding the bitter flavor in the water. But it's only marginal.
Notes: Food processor is best for ease of use. You can also use a blender (it's just more annoying to scrape out all batter) or a NutriBullet (too small for full batter, so blitz oranges first, transfer to bowl, blitz everything else and then mix).
Notes: Delicious plain because it's so moist and flavorful, but a dollop of Greek or plain yogurt, or creme fraiche is also wonderful. Otherwise, slightly warmed with vanilla ice cream!