Put the flour in a bowl and make a well in the middle. Crumble the yeast into the hollow and sprinkle the sugar over it. Put salt only on the outer edge of the flour. Heat the butter in a saucepan, add the milk and extinguish with the quince sauce. Then pour the whole thing over the yeast, flatten it a little so that the yeast does not clump. Then knead everything together and let rise for about 20-30 minutes.
Then continue processing. Grease a large baking pan (or 2 small ones) and add the batter. Let go again until the volume has doubled.
Then bake in the preheated oven at 170 ° hot air for about 30-40 minutes.
Making quince puree:
Remove the fluff from the quince and rinse briefly. Remove the core and if necessary peel the quince, cook with the sugar until soft and puree.