INGREDIENTS
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1 pound savoy cabbage
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3 tablespoons olive oil
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1 large onion, halved and cut into very thin rings
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2 large garlic cloves, minced
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6 canned Italian plum tomatoes
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1/2 cup tomato liquid from the can, or chicken stock, or beef stock
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2 tablespoons red-wine vinegar
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1 teaspoon dried thyme
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salt and pepper to taste
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1 tablespoon butter
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Pecorino Romano for grating