Feel free to use any fresh sausage of your choice. Swiss chard comes in a rainbow of coloured stems. Any colour can be used and once cooked its flavour is similar to a mild spinach.
These little fellows of Finnish descent puff up in the oven just like a Yorkshire pudding. Once they fall, load them up with fresh berries. Alternatively you can make one large krupso in a 9- x 13-inch cake pan.