INGREDIENTS
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Salt and pepper
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1 pound whole wheat macaroni or penne pasta
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3 tablespoons butter
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2 large onions--peeled, quartered and thinly sliced
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1 bay leaf
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1 teaspoon ground thyme (about 1/3 palmful)
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2 tablespoons flour
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1 1/2 cups whole milk
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1/2 cup beef stock
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2 1/2 cups grated gruyere or swiss cheese
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2 tablespoons dijon mustard
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1/4 cup finely chopped fresh chives