Knead all ingredients together in the flour trough from the center. Rest in the refrigerator for approx. 20 min. Roll out three millimeters thick, place in a buttered tart pan and work the edges neatly.
Medlar puree:
For the medlar puree, remove stems and flower base. Cook the fruit on the sieve insert of the pressure cooker for about 15 minutes. Pass through a sieve and sweeten the puree with honey. Add the walnuts and the Calvados. Then spread the medlar filling about one centimeter thick evenly on the rolled out dough.
For garnish:
Cut peeled, halved apples into narrow slices and garnish the tart with them. Brush with melted butter and lightly sugar.
Tip: The higher the fat content in the yogurt, the more aromatic and creamy the result!