A syrup of this density is filtered to remove sugar crystals and calcium malate.
The filtered syrup is placed in the target containers while hot (usually 82 degrees C or more). To sterilize the stopper, the containers are turned upside down.
Sunflower halva is popular in the former Soviet Union, Bulgaria, and Romania.
It’s made with roasted and ground sunflower seeds, instead of tahini. In the 1990s, Ukrainians produced around 4000/5000 tons of sunflower halva annually.