4 Eggs
1 Egg Yolk
¾ cup Caster Sugar
1 Lemon, Juiced
1 Lemon Zest
½ cup Cornstarch, Sifted
1 pinch Salt
¾ cup Sugar
3 tablespoon Starch, Potato
¾ cup Orange Juice
1 tablespoon Lemon Juice
3 Egg Yolks
2 tablespoon Margarine
Sponge roll: preheat oven to 350f. Beat egg whites until stiff, adding half the sugar gradually. Using the same beater, beat the yolks while adding the remaining sugar, until mixture is very light. Stir lemon juice, rind, cornstarch and salt into yolks. Gently fold in whites, starting with a quarter of the mixture, then adding the rest. Gently spread on cookie sheet lined with parchment paper sprayed with vegetable oil spray. Gently smooth the surface. Bake 10 mins or until sponge has risen slightly and lightly browned. Remove from oven and turn cake out onto a clean cloth. Allow to cool. Spread orange filling evenly over cake and gently roll up using cloth to help lift cake. Sprinkle with sugar &/or whipped cream .
Orange filling: combine sugar, potato starch, orange juice and lemon juice in a saucepan and bring to a boil. Boil 1 min, while stirring constantly. Remove from heat. In a separate bowl, beat egg yolks. Stir a little bit of orange mixture into egg yolks then add yolks to the sauce pan. Cook gently for one min. Stir in margarine, allow mixture to cool before using.