Preheat oven to 375 degrees.

In skillet cook turkey and onion over medium high heat. Cook until turkey is browned, about 12 minutes.

While cooking, add sweet potatoes to a stock pot and cover with water. Bring to a boil, cook for 15-20 minutes or until tender.

Add in frozen vegetables, stock, Worcestershire, thyme, garlic and tomato paste to turkey mixture. Reduce heat to medium low and simmer for 8-10 minutes.

Drain sweet potatoes. Gradually add in milk and butter. Use a potato masher to break up potatoes and turn it into a mash. .

In greased pie dish, add vegetables and turkey. Top with sweet potatoes. Bake uncovered for 25 minutes.

Let it cool for 5 minutes before serving. Top with rosemary.