INGREDIENTS
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1 pound pennette or ditali
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1/4 cup extra-virgin olive oil
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1 large onion, finely chopped
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1 pound ground lamb
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1 pound ground veal
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One 28-ounce can diced tomatoes, drained
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1 tablespoon tomato paste
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2 teaspoons chopped marjoram
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2 tablespoons chopped flat-leaf parsley
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Salt and freshly ground pepper
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1 stick unsalted butter
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3/4 cup all-purpose flour
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1 quart whole milk
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2 large egg yolks
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1 cup freshly grated Parmigiano-Reggiano cheese