They use Emmer wheat, which is the variety that would have been used at the time. It's still grown commercially on a small scale, so you can buy some to try out

They use Emmer wheat, which is the variety that would have been used at the time. It's still grown commercially on a small scale, so you can buy some to try out without too much cost. https://en.wikipedia.org/wiki/Emmer https://en.wikipedia.org/wiki/Emmer