Santaman, it was an old way to preserve soft fruits like raspberries. Thus preserved raspberries were whole, and used to decorate deserts and cakes.
It is easy, if you know how.
I have not seen it being done since she did it. Outdated tech. It worked though.
She made a sugar syrup. Placed selected fruit in the jar, poured the cold syrup on top, covered fully.
Sealed the jar, placed in a water bath. Boiled for a certain time. Do not remember how long though.
I buy my decoration fruit frozen.
Boil soft fruit the normal way and it turns to much.
Robson V, ask your Polish friends if they have a special jar for the kraut.
Those have a collar, and a lid like a soup plate. Compress salted kraut tightly in jar, must have enough liquid that covers at the end. Lid on, pour water in the collar. Prevents Oxygen coming into the jar.
https://images.app.goo.gl/ZCqR6XzuWXjRCAs4A