riddle cake
/ˈrɪdlkeɪk/English regional (northern )
noun
A kind of leavened bread or cake made from oatmeal, the dough for which is often riddled or shaken to make it expand before baking.
Origin
Late 17th century; earliest use found in John Ray (1627–1705), naturalist and theologian. From riddle + cake. With the semantic motivation of the first element, compare discussion at riddle bread.