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I never had sweets! Didn't even know they make sweet out of them.

Maybe you just didn’t pay attention and therefore didn’t see?
Sweets have a sweet and sour taste, I still like them :-)

I never saw any products made with Barberry. It is not really common in Poland to use for food.
Only recently I read it can be used in liquors. But never saw anyone using it that way.

Jam and drinks are also made from barberry in Russia
Barberry jam recipe:
Barberry - 0.5 kg
Sugar - 300 g
Water - 1 glass

Peel the berries from the stems and leaves.
Rinse well several times
Add sugar and warm water
Bring to a boil, reduce heat, and simmer for about 30 minutes on a minimum.
Let cool
Heat again for 5 minutes to a boil and cool again.
Then, for the third time, heat the barberry jam for 5 minutes and put it in sterilized jars, immediately tightening the lids.

P.S. It is advisable to collect the barberry after the first frost - the peel of the berries becomes less dense, their taste is significantly improved.

That is so cool! It does seem like a lot of berries. They are so tiny!
Thank you :))