Cook:
Meanwhile, add to a small skillet over medium heat:
Add to the skillet and cook, stirring, until softened, about 2 minutes:
Add and cook, stirring, until the mushroom liquid is evaporated, 3 to 5 minutes:
Stir in:
Remove the skillet from the heat. When the barley is tender, drain off any excess liquid, transfer to a large bowl, and cover to keep warm. Return the skillet to medium-high heat and add:
Cook, stirring, until the asparagus is bright-green and tender, about 4 minutes. Toss the asparagus-mushroom mixture with the barley and season to taste. Serve warm.