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Tribune Content Agency A yogurt-blue cheese sauce lightens up a classic steak dish.

Steak frites is a French bistro staple. Here we swap roasted sweet potatoes for the fried spuds and make a yogurt-blue cheese sauce instead of compound butter to lighten things up.

Montreal-Style Hanger Steak & Sweet Potato Frites

Serves 4

Preparation time: 45 minutes

2 pounds sweet potatoes, peeled

3 tablespoons extra-virgin olive oil, divided

1 teaspoon smoked paprika

1 teaspoon ground cumin

1/2 teaspoon salt

1/4 teaspoon ground pepper

1/4 cup nonfat plain yogurt

1 tablespoon finely crumbled blue cheese

1 tablespoon minced fresh chives, plus more for garnish

1 to 1 1/4 pounds hanger or flat-iron steak, trimmed

2 teaspoons 25 percent less sodium Montreal steak seasoning

Position racks in upper and lower thirds of oven; preheat to 450 F. Coat 2 large rimmed baking sheets with cooking spray.

Slice sweet potatoes crosswise into 1/4-inch-thick slices. Cut each slice into 1/4-inch-wide fries. Toss with 2 tablespoons oil in a large bowl; add paprika, cumin, salt and pepper, and toss again. Divide the fries between the prepared baking sheets, spreading evenly. Bake on the upper and lower racks, stirring the fries and switching the pans halfway, until browned and tender, 25 to 28 minutes.

Meanwhile, combine yogurt, blue cheese and chives in a small bowl.

When the fries are halfway done, heat the remaining 1 tablespoon oil in a large cast-iron skillet over medium-high heat until hot but not smoking. Sprinkle steak with Montreal steak seasoning and cook, turning once, until browned on both sides, 2 to 4 minutes per side for medium. Let rest on a clean cutting board for 5 minutes. Slice crosswise into 1/2-inch-thick pieces and serve with the sweet potato fries and sauce, garnished with more chives, if desired.