5 large Sweet potatoes, quartered
1/4 cup milk
2 tablespoons butter
pinch nutmeg
salt and pepper to taste
2 tablespoons vegetable oil
2 medium onions, diced
1 stalk celery, finely chopped
1 medium carrot, diced
1 teaspoon dried thyme
1/4 teaspoon chili flakes
1 pound lean ground beef
2 cups cooked roast beef, diced
3 tablespoons flour
1/3 cup beef broth
2 tablespoons tomato paste
2 tablespoons Worcestershire sauce

Preheat oven to 375°F.

Bring large pot of water to a boil, cook potatoes until tender, about 20 minutes; drain.

Add milk, butter, nutmeg, salt and pepper to potatoes and mash until smooth and fluffy.

Saute onions, carrot, and celery in oil over medium heat for 5 minutes.

Sprinkle with thyme and chili flakes.

Add ground beef, and cook until no longer pink.

Stir in roast beef, sprinkle with flour, then pour in beef broth, tomato paste,worcestershire ssauce, salt and pepper; stir well. Reduce heat and cook for 5 minutes.

Spread meat mixture in a square casserole, spread mashed potatoes over top and bake 35-45 minutes until heated through.

Place under broiler for 1 minute.