Sieve together corn flour, baking powder
and plain flour. Add in castor sugar, 1 cup sesame seeds and 4 lightly
beaten eggs. Pour melted margarine over flour, mix and knead well.
Roll out dough into 3 mm thick. Cut dough into 6 cm x 3 cm rectangles.
Snip on one side of the rectangle. Brush top of the cookies with egg
yolk and sprinkle with sesame seeds. Bake in a preheated oven at 190
degrees Celsius for 15 minutes.