Are you asking about Chaga?? It is usually located on yellow birch, ( in Northern Maine) Extraction either by water (tea) or ETOH Grain or by both as a double extraction.
I'd go with a session style BOMM. Keep the OG low for you first try, aim for 7-9%. Use staggered nutrients, and degas. The biggest issue with most newbie mazers is aiming to high for their first few trys and having to let it age for years. Nutrients+degas+lower OG = faster time to drink.
Use sorbate and back sweeten to taste.