Blood magic

Birch blood is nice. I also enjoy cinnamon tree skin.

Many russians like to drink birch sap, which is a colorless, lightly sweet liquid you get when you prick birches in the right place with little steel tubes at the right time (dunno really which place and time that is). That stuff can be bought in stores but most russians don't trust those. It contains a lot of minerals and is supposed to be quite healthy, while it's refreshing and like medium pleasant to the taste.