Sieve together corn flour and flour.
Cream margarine and sugar. Add in egg yolks and continue to beat well.
Fold in vanilla essence, grounded nuts and flour mixture. knead well.
Roll out dough into 1/2 cm thickness and cut with cookie cutters into
required shape. Spread jam and sandwich the biscuits. Brush biscuits
with egg yolk and put on greased trays. Bake at 180 degrees Celsius
for 15 to 20 minutes.