Sweet potato shepherd's pie

1. Beat mashed potatoes with yolks until smooth; set aside.
2. Browni ground beef, drain if needed, and add onions and garlic.
3. Cook for 5-6 min. add tomatoes and paste and cook 2-3 more min. remove from heat and add bread crumbs, raisins, and spices, mixing well.
4. Turn meat mixture into a lightly greased pan. Top evenly with potatoes.
5. Bakei for 1 hr. At 375 degrees or until top is browned.
6. Cut into even squares and sprinkle each with bacon or chopped scallions.