Preparation / Directions:
Heat oven to 350 degrees. In a large mixing bowl combine the beef, onion, rice, garlic, spinach, mustard, thyme, rosemary and pepper; pack into a 9 x 5 x 3 inch loaf pan lightly coated with the cooking spray. Bake, uncovered for 45 minutes or until browned. Let cool, remove from the pan and drain. Meanwhile, prepare the sauce. In a small, heavy saucepan combine the broth, onion, mushrooms, thyme, rosemary and tomato paste. Bring to a boil; reduce heat, cover and simmer for 30 minutes. Blend in the cornstarch mixture and cook, stirring, until slightly thickened - 1 to 2 minutes. Transfer the meat loaf to a warm platter; spoon some sauce over it. Serve remaining sauce on the side.