INGREDIENTS
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1 teaspoon extra-virgin olive oil, plus more for baking dish
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4 medium zucchini, halved lengthwise (about 2 pounds)
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1 pound spicy Italian sausage, removed from casing
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1 small onion, coarsely chopped (about 1 cup)
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3 cloves garlic, minced (about 2 tablespoons)
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1 cup coarse fresh breadcrumbs
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2 teaspoons lemon zest, plus 1 tablespoon juice (from 1 lemon)
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1 1/2 ounces grated Parmesan (about 3/4 cup), plus shavings for garnish
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1 teaspoon coarse salt
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1 large egg, lightly beaten