Ingredients:
CAKE:
6 egg whites
6 egg yolks
280 g (10 oz) powdered sugar
120 g 120 g (4 oz) cake flour
juice and zest of 1 lemon
FILLING:
1/2 l (2 cups) milk
1 tsp vanilla extract
3 Tbs flour
140 g (5 oz) butter or margarine
140 g (5 oz) sugar
juice of ½ large lemon
Preparation:
- CAKE: Whip the egg whites till stiffened.
- Gradually add the sugar and beat well again. Add yolks, lemon juice and lemon zest and beat well. Gently fold in the flour.
- Pour into lined tin and bake at 180 C (350 F). Insert a skewer into the center of cake and if cooked it will come out clean.
- FILLING: Combine milk, vanilla extract and flour. Cook for 10 minutes, stirring constantly.
- In a separate bowl mix butter, sugar and lemon juice until fluffy. Fold in the milk mixture.
- Fill the cake with the filling. Spread smoothly over top and sides of the cake.

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Nice recipe, very simple, but can someone please tell me what it means to “gently fold in the flour” or to “fold in the milk mixture”? I’m from Croatia, and we don’t have such terms here. Is “gently folding” simply “slowly mixing the flour with the remainder” or something else?
Thanks
Gently fold = lagano umiješati (kako se ne bi uništio snijeg od bjelanjaka)
Ah, thanks a lot!