Grease 20 x 20 cm dish.

Crumb biscuits finely.

Melt margarine.

Add crumbs and mix well with margarine to form a crust.

Press down in prepared dish and place in fridge to harden.

Mix egg yolks and all other ingredients well.

Pour over crust.

Beat egg whites and sugar to stiff peaks and spoon on top of lemon mixture.

Heat oven to 180* and bake for 10 minutes.

Decrease heat to 160* and bake a further 20 minutes.

Turn oven off and leave pie in oven with door ajar until cooled.