Where most stroganoffs are rich messes of overcooked meat in goopy sauce, this mushroom version is light and fresh with bright, floral notes from the sherry and a little bit of spice. A dollop of sour cream added to each diner’s plate adds a touch of creaminess without thickening the sauce too much. —HealthyDelicious
Melt the olive oil and butter together in a heavy pot set over medium heat. Add the onions and cook, stirring occasionally, until they become very soft and begin to turn golden – about 10 minutes. Add the mushrooms, 1/4 cup sherry, sage, salt, peppercorns, and pepper. Whisk in the cornstarch. Bring to a simmer and cook for 10 to 15 minutes or until the mushrooms soften and the liquid has cooked off. Turn the heat to high and add the remaining sherry and cook for 1 to 2 minutes, allowing it reduce into a thick sauce.
Serve over top of noodles with a dollop of sour cream.