Sweet Potato-Topped Shephard's Pie

Rachael Ray's recipe

3 large or 4 medium sweet potatoes, peeled and cut into chunks
Salt and pepper
1 cup milk
3 tablespoons butter
1 egg, beaten
1 teaspoon paprika or sweet smoked paprika
1 1/2 tablespoons extra-virgin olive oil (EVOO)
8 ounces cremini or white mushrooms, quartered
1 1/2 pounds ground sirloin1 onion, chopped
2 large cloves garlic, chopped
2 tablespoons fresh sage, thinly sliced, or 2 teaspoons dried rubbed sage (about 2/3 palmful)
1 cup frozen peas
2 tablespoons flour
3/4 cup dark beer (optional)
1 cup beef stock (1 1/2 cups if not using beer)
About 3 tablespoons worcestershire sauce
2 tablespoons dijon mustard
A little chopped fresh parsley, for garnish

Place the sweet potatoes in a large pot, cover with water and bring to a boil. Salt the water and cook the potatoes until tender, about 18 minutes; drain. Return the potatoes to the hot pot and mash with the milk, 1 tablespoon butter, the egg and paprika; season with salt and pepper.

Preheat the broiler and position a rack in the lower third of the oven. Place a heavy pot or large dutch oven on medium-high heat. Add the EVOO, 1 1/2 turns of the pan, and the mushrooms and cook until darkened, 6 to 7 minutes. Add the sirloin and cook until browned, 5 minutes. Add the onion, garlic and sage; season with salt and pepper. Cook until the onion is softened, about 5 minutes. Stir in the peas.

While the onion cooks, heat a small saucepan or skillet over medium-high heat. Add the remaining 2 tablespoons butter to melt, then whisk in the flour for 1 minute. Add the beer, if using, and cook until reduced, a minute or two. Add the beef stock and worcestershire; season with salt and pepper. Cook until thickened slightly, then whisk in the mustard. Stir the gravy into the meat..

Pour the meat and gravy into a casserole and top with the sweet potatoes. Broil until the potatoes are set and lightly golden-brown at the edges. Top with the parsley.