"Happy marriage cake" is the translated name of a traditional Icelandic dessert called hjónabandssæla. It is one of the most beloved sweets in Iceland and renowned for being so easy that even new brides can make it, hence the name. Hjónabandssæla is a layered cake made with a sweet, buttery oatmeal crust and filled with tart rhubarb jam. The cake is baked until golden brown and sliced into squares for serving.