The Answer to the riddle:
these are the Medlar fruits – Mespilus germanica. The medlar is a fruit tree that originates in the Caucasus, Iraq and Iran and was distributed at ancient times to all Europe. The fruit ripen only after falling from the tree, after bletting. the ripe fruit are brown. they have texture and taste that are similar to apple sauce. they are used to prepare deserts such as compote and jelly. the fruit have high nutritional and medicinal value, they contain antioxidants, vitamins and many nutrients. they are used in traditional medicine for treating the digestive system, the liver and kidneys, as well as in preventive medicine.