Cinnamon Raisin Challah Buns

"One bun, three options: you can bake them all straight away after a little prove, nested next to each other in a gratin dish or two. You can delay the gratification and chill them in the fridge overnight – then presto, a fresh bake for breakfast. Or you can pack them into individual ramekins or bun cups and freeze, for an occasional treat. The individual bun freezer option is clever because you just place one or four frozen buns in the cold oven last thing at night. They defrost and prove happily overnight, and you just press the button in the morning. "