INGREDIENTS
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2 large baking potatoes, peeled and quartered
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1/2 pound carrots, halved crosswise
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2 tablespoons butter
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Salt and pepper
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2 tablespoons extra-virgin olive oil
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2 1/2 pounds precooked link sausages, such as kielbasa or bratwurst, cut into 4-inch pieces and pierced with a fork
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3 scallions, white and green portions thinly sliced separately
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1 16 ounce bag sauerkraut, rinsed
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2 bay leaves
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Mustard and sour cream, for serving