STEP 4/6
It is used as a complex network with small holes in the heart to filter out small, hard seeds. Hard raspberry seeds, which are not crushed even by a blender, are separated like this when extracted with a crude liquid. You can only drink raspberry juice.
STEP 5/6
They are separated bokbunja seeds and cheong. It's such a waste to just throw it away. You can add raspberry leaves and boil them in a pot to make jam. You can put it in a sterilized glass bottle and pour fruit liquor to make raspberry wine. It's good to take out raspberries in a couple of months and ripen alcohol for more than a year. And if you're cooking, you can use it to bake, so there's nothing to throw away.