Slice zucchini into ¼” strips. Lay strips on a paper towel and sprinkle salt over both sides. Set aside to sweat for 15-20 minutes.
Prepare the Sauce
While the zucchini sweats, brown the beef in a large skillet. Add onions and green peppers. Sauté for 3-5 minutes until peppers are soft.
Add remaining sauce ingredients. Simmer, uncovered, 5-7 minutes or until sauce is thick and fragrant. Remove from the heat.
Putting It Together
Pat zucchini slices dry.
In an 8x8 baking dish layer 1 cup sauce, ⅓ of the zucchini slices, and ½ c cheese. Repeat the layers twice more, but do not add the final layer (½ c) of cheese.
Cover the lasagna with aluminum foil and bake for 30 minutes.
Uncover the dish and top with the remaining cheese. Bake for an additional 15-20 minutes, until the cheese is melted and the lasagna is bubbly in the center.
Remove from the oven and let stand 5-10 minutes before serving.