Lemmitor @A_[email protected] in this community tipped that if the process serves and luck is on one's side, fermented birch sap can be better than champagne. Right now is the time when sap can be collected, so I'm giving it a shot!
The tree isn't terribly bothered, the tap hole is only a few millimeters deep. I only do one tap per tree.
Plan is to empty these tap bottles off several trees once a day into an intermediate container, use a Campden tablet per container and keep the intermediates in the fridge until I have enough, five liters maybe? Then one liter yeast starter, possibly with some cane sugar to lend a little extra aroma and colour (the sap is clear). Ferment fingers crossed. Serve force carbonated. Wish mi luck :D
That was a quick one! The result is a dry, refreshing and probably low ABV product. The colour comes from added dark cane sugar. It only took a couple of days to get 6 L of sap out of three trees. And yes, there is a light, hard to describe, maybe citrus-like taste from the sap.