1. Chop the onion and pepper
2. Mince the garlic
3. Clean, peel and slice the mushrooms
4. Heat the fry pan to medium and start sauteing the onion
5. While it is cooking, peel the zucchini and slice about 1/8 inch thick — a mandolin will help with this but if you are using a knife slice them thin and as even as possible
6. When the onions and peppers are soft, remove them set aside
7. Add the mushrooms and cook until soft and browned (add fat to the pan if necessary)
8. Add the garlic for just a minute or two at the end, remove and set aside with the onions and peppers
9. In the same pan now cook the chopped meat but just so the rawness is gone — leave it pink as it will cook in the baking dish
10. While you are doing all that you can also start to slice the zucchini with either the mandolin or a knife

Putting It All Together

1. Pour 1/3 of the tomato sauce in the bottom of the baking dish
2. Line the pan with the zucchini slices on the bottom
3. Use 1/2 of the beef and layer that on top of the zucchini
4. Sprinkle 1/3 of the sauteed vegetables on top
5. Now lay another row of zucchini slices, tomato sauce, beef and vegetables
6. And finally the last layer of zucchini slices, tomato sauce, and vegetables (there should be only two layers of beef, 3 of the rest)
7. Bake at 375 degrees F for about 25 minutes
8. Remove and let cool for a bit then serve
9. This tastes even better the next day if there is any left