Doctor Frankenstein’s favorite beer
The semiprecious stone amber is fossilized tree resin. Sometimes, insects and other small critters are trapped by sticky tree sap, and become encased in amber. Sometimes, microorganisms are found inside amber. Sometimes, they’re yeast that can be revived and used to brew beer.
Here’s an article about the yeast, revived and used to brew beer.
Here’s the homepage of the folks who used ancient yeast to make beer.