INGREDIENTS
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2 tablespoons olive oil
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3 pounds boneless sirloin tip roast, trimmed and tied
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2 1/2 cups thinly sliced onion
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6 small carrots, cut into 1-inch chunks
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3 garlic cloves, sliced
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2 rosemary sprigs
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1 1/2 teaspoons kosher salt
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1 teaspoon freshly ground black pepper
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1/2 cup water
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1/4 cup reduced-fat sour cream
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2 tablespoons prepared horseradish
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2 tablespoons chopped fresh flat-leaf parsley (optional)