Preheat oven to 180C.Mix the first 4 ingredients well.
Melt the butter, separate the eggs. Mix the butter with the sugar, egg yolks, flour and saffron powder. Make up the package of custard powder into custard (this is where you use milk as directed). Mix in the melted butter, cool down completly. Whisk the eggwhites until stiff, gently lift under custard mix.
Put the quark mix into a spring form, even out. Then top with the egg and custard mix, again even out. Put into the oven and bake for about 60 minutes, or until set. If the cake gets to dark before it sets top with baking paper. It should be golden brown and set, but not dried out.
Cool, serve cold. This cake has no pie crust.
