The Scandinavian Swedish Rye bread is slightly sweet. Sometimes they include sweeteners, citrus peel or spices like anise, cardamom, or fennel. This is a very simple canapé and the toppings are egg and prawn. Prawns are a good source of complete protein. Dietary protein is necessary to support ongoing function of every organ and tissue in your body. It also serves as a backup source of fuel for energy production. Eggs are prized for their gold standard of protein sources.