Rosti Margrethe Bowl 1.5L Humus. The bowl was designed for Rosti by Sigvard Bernadotte and Acton Bjørn's design studio in Copenhagen and in 1954 with the royal house's permission named after Queen Margrethe 2. The new version of the Margrethe bowl is made of Durostima®, a recyclable plastic material. The bowl is now even stronger and more shatterproof, and with the new material it can also withstand the microwave and freezer.