Meanwhile, as potato slices are baking, start your meat sauce. In a skillet, add your oil, heat, and then add your ground beef, breaking up into small pieces, drain excess grease. Once ground beef is no longer pink, add your onions. Add the rest of your spices, herbs, wine and simmer for 2-3 more minutes, add your tomato sauce. Stir thoroughly and simmer for a couple of more minutes, (sauce will be thick) turn off heat. Set aside.