INGREDIENTS
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Good olive oil
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2 large yellow onions, cut in half and sliced
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2 garlic cloves, minced
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1 pound medium round potatoes, unpeeled
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3/4 pound zucchini
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1 1/4 pounds medium tomatoes
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1 teaspoon kosher salt
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1/2 teaspoon freshly ground black pepper
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1 tablespoon fresh thyme leaves, plus extra sprigs
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2 ounces Gruyere cheese, grated