INGREDIENTS
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6 tablespoons extra-virgin olive oil
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2 small onions, thinly sliced
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1 pound zucchini, diced
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2 teaspoons kosher salt
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1 1/2 pounds ground turkey
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2 tablespoons tomato paste
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1 1/2 cups white wine
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2 fresh bay leaves
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1 3/4 pounds russet potatoes, peeled and thinly sliced
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(1/4 inch thick or less)
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8 ounces low-moisture mozzarella, shredded
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1 cup grated Grana Padano or Parmigiano-Reggiano
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2 tablespoons unsalted butter, at room temperatur