Brown the mushrooms hard in a dry pan before any liquid touches them; mushrooms stewed from raw taste of water. The barley will keep drinking stock as it sits, so make it looser than you want to eat it.
It did not make it into the plan for these seven days.
The method above is what decides the dish, not a step-by-step recipe. The link runs a web search on the name: this page has no vetted sources of its own, and will not invent any.