This is less a recipe and more a set of guidelines and guesses, partly inspired by the Dundulis Moko Maukas Akmeninis stone beer in Lithuania, as described by Simonas Gutautas. It’s hard to say what kind of efficiency you’ll get—and probably best not to worry about it, the first time around. Your mileage will vary. Be safe. And good luck!
For practical tips on mashing with hot stones, see For Those About to Rock, and for much more on traditional stone beer, see Fire & Brew Stone.
ALL-GRAIN