Decoct Chaga in water 1 hr; turn off heat . Then add syrup. Let cool to room temp.
Add to fermenter cups of the Chaga decoction that was sweetened add plums as a yeast colony and let sit uncovered 2-3 days stir or shake each day. Plums should be barely covered.
Add remaining decoction to fermenter and watch bubble for 7 days.
Bottle and consume within 1 month at room temp. In refrigerator it will keep for 4 months. Contact with natural corks at room temp will result in popped corks every time .
Cheers and Enjoy