Hi, how to make a halva from a sunflower seeds at home? Thank you.

Irina, you'll have to blend your sunflower seeds into a nut butter before making the halva. I have a recipe on this site for making halva with almond butter. Here it is. https://food52.com/recipes/37533-chocolate-covered-almond-halvah

Lots of recipes online.
You'll need a blender or food processor (or mortar and pestle and lots of muscle power.
ingredients: Sunflower seeds, powdered or confectioners sugar, vanilla extract, melted butter.