When's the best time for a doughnut? Anytime. At this 24-hour doughnut shop in Tempe, run by one of the owners of BoSa Donuts, you can get your fried fritter on before joining the rat race or, via the drive-thru, after partying with the night owls. And with more than 40 varieties to choose from — think buttermilk, Boston Cream, cinnamon crumb, toasted coconut, and giant bear claws — at Arizona Donut Co., it's a matter of not when you'll be eating doughnuts, but which doughnuts you'll be eating.