For the base, put all the ingredients in a bowl and knead into a smooth dough.
Line the bottom of a round baking pan with baking paper and grease the sides with a little margarine.
Spread the dough in the baking pan and press up the edges. Place in the refrigerator.
For the filling, mix yogurt, sugar, vanilla pudding powder and lemon zest together.
Melt margarine briefly (in saucepan or microwave) and mix in.
Stir everything together until smooth.
Remove the baking dish from the refrigerator, pour the filling into the dish and smooth it out.
Bake at 180 degrees top-bottom heat for 60 minutes and enjoy!