From the petals? How so?:D
After picking, the fruit is dried for a couple of days until it softens, then the lower part is removed (the prickly part where the flower used to be), washed, boiled, mashed.
The way we used to prepare it was painful, you tear off the prickly parts with your fingernails.
But the taste is something that can not be compared with anything.
RE: Rosehips for the finches.