Zwiebelkuchen (which translates literally to onion cake) is, in the most basic sense, some sort of bread or crust, filled or topped with onions. The recipe here uses a thicker bread base and tops it with softly cooked onions and bacon suspended in soft custard. This Eastern European dish is traditionally served in the fall, but I feel the addition of some fresh scallions makes it perfect for a hearty spring brunch. More