Once not only a staple but a main course, this is one of those side dishes many people can’t get enough of. Serve with something light and lean, like plain broiled fish.
Ingredients
2poundsbaking potatoes, peeled and cut into quarters
Boil the potatoes in a pot with salted water to cover until soft, at least 15 minutes. Meanwhile, put 2 tablespoons of the butter in a skillet over medium-high heat. When it’s foam subsides, add the onion and mushrooms, along with a large pinch of salt and a sprinkling of pepper, and cook, stirring occasionally, until they soften and brown, 10 to 15 minutes. Both onion a