Found this weird fruit growing in our garden. We asked our Bulgarian neighbour, Maria, and she said they are called Drenkie, Дренки. They are supposed to be good for upset stomachs and she recommended making a compote out of them.
We looked them up and they are Cornelian Cherrries.They taste strange, quite astringent, but quite pleasant as long as you pick the ripe ones that have fallen off the tree. We have eaten them for pudding, and with ice cream and on yoghurt. Lovely!