A very rich side dish or sauce, or an opulent first course when spooned over toast.
Heat in a large skillet over medium heat:
Add and cook, stirring, until translucent, about 5 minutes:
Add:
Increase the heat to medium-high and cook, stirring often, until the mushrooms release and then reabsorb their juices, about 5 minutes. Add:
Reduce the heat to medium and simmer until the sauce is slightly thickened. Taste and adjust the seasonings, then stir in: