Place the curd on a sieve and let it drain for 30-45 minutes. Put mandarin oranges in a sieve and drain. Mix sugar, 30 g soft butter, egg yolk, eggs and lemon zest with the whisks of the hand mixer until thick and creamy. Stir the quark and starch into the egg yolk mixture. Finally fold in about half of the mandarins. Melt 100 g butter in a pot and let it cool down.
Dust a large tea towel with flour. Put 1 strudel sheet on top and brush it thinly with butter. Place the 2nd leaf on top, brush with butter again and sprinkle half of the breadcrumbs on top, except for a rim of about 3 cm. Spread half of the quark mixture on the lower half of the pastry surface, leaving the edges free on both sides. Whip free side edges over the filling. Lift the cloth from the long side where the filling is and roll up the strudel. Slide the strudel with the seam side down on a baking tray lined with baking paper. Make the 2nd strudel in the same way. Brush the strudel with butter. Bake in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for approx. 30 minutes. In between, brush 1-2 more times with remaining butter. If necessary, cover the strudel with aluminium foil at the end of the baking time.
Slide the strudel with the seam side down on a baking tray lined with baking paper. Make the 2nd strudel in the same way. Brush the strudel with butter. Bake in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for approx. 30 minutes. In between, brush 1-2 more times with remaining butter. If necessary, cover the strudel with aluminium foil at the end of the baking time. Finely chop the pistachios. Let the strudel cool down for about 30 minutes, then cut it into 10 pieces and decorate with chopped pistachios and mandarins
Waiting time approx. 1 hour