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Preheat the oven to 375 degrees F.
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Prepare the vegetables for stuffing by removing the stalks of 4 of the mushrooms (save the stalks for the stuffing). Halve the tomatoes and discard the seeds. Halve 2 of the zucchini lengthwise and scoop out the centers with a spoon (save the centers for the stuffing).
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Arrange the prepared vegetables on a greased baking sheet, season lightly with salt and pepper.
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Mince or grate the remaining 3 mushrooms and the leftover stems. Dice the remaining zucchini.
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Saute the ground pork (season with your favorite seasonings) with the onions over medium heat and add the minced mushrooms. Then add the diced zucchini plus the remaining centers.
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Cook until soft, then add the can of tomatoes and continue to cook until very little liquid is left, about 10 minutes.
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Pile the filling into the prepared vegetables on the baking sheet and sprinkle with mozzarella cheese. Bake for 35-45 minutes.