Charred-Onion Mashed Potatoes

Directions

1. 1
   Put 1 1/2 pounds unpeeled all-purpose potatoes, cut into 1-inch cubes, in a medium saucepan and cover with water.
2. 2
   Add 1 teaspoon salt and boil over moderate heat until tender, about 15 minutes.
3. 3
   Drain, return to the pan and keep warm.
4. 4
   Melt 4 tablespoons unsalted butter in a skillet.
5. 5
   Add 1 minced onion and cook over moderately low heat, stirring, until well browned, about 20 minutes.
6. 6
   Mash the potatoes with 1/4 cup hot milk and 2 tablespoons butter.
7. 7
   Stir in the onions and season with salt and pepper.