Cook the quince in advance: peel, dice into small cubes, and cook in a little water until tender. Drain well, cool completely, and set aside for the dough.
Sift the flour into a bowl, add the yeast, sugar, lemon zest, and gingerbread spice mix. Mix well.
Add the warm milk, melted butter, and egg. Knead until you have a smooth, elastic dough. If it's sticky, adjust the consistency with a little flour.
Cover and let rise in a warm place for about 1 hour, or until the dough has doubled in size.
Gently knead the cooked quince into the risen dough. Be careful not to break the quince pieces, but distribute them evenly.
Shape into a stollen: roll the dough into an oval, then fold one side back over so that it slightly covers the other. Place on a baking sheet lined with parchment paper.
Let it rest for another 30 minutes. Meanwhile, preheat the oven to 350°F (180°C) using the conventional setting (top and bottom heat). Bake for 35–40 minutes, or until golden brown. If it browns too quickly, cover with parchment paper.
Cool completely, then dust generously with powdered sugar. Tip: It tastes best after 2–3 days when the flavors have melded together. Store in an airtight container.
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