Add and brown ground beef, breaking apart into small bits.
Add zucchini, quartered lengthwise, and chopped into chunks.
Season to taste with salt, p[epper, and cayenne.
Add tomatoes (with all the juice) and season again to taste.
Let the sauce simmer while you cook penne until slightly less than done. Preheat the oven to 350 degrees.
Layer sauce, cheese, and pasta in baking dish, starting with a little bit of sauce on the bottom and ending with cheese on the top. (I do sauce, penne, sauce, cheese, penne, sauce, cheese.)
Put dish in oven and cook until bubbly (20-30 minutes).
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