1 3/4 pounds 1 1/2-inch-thick center-cut top round steak, sliced horizontally into 6 1/8-inch-thick slices
4 tablespoons unsalted butter
5 tablespoons olive oil
1/2 medium onion, finely chopped and 1/2 medium onion, thinly sliced
1 pound white mushrooms, finely chopped
Coarse salt and freshly ground pepper
6 tablespoons finely chopped fresh flat-leaf parsley
1/4 cup dry breadcrumbs
1 large clove garlic, minced
1 can (15-ounce) tomato sauce
1/2 cup red wine
Grated Beets, for serving
Buckwheat Groats, for serving
1. Preheat oven to 350°. Place slices of steak between two pieces of plastic wrap, and pound to an even thickness; set aside.
2. Make the filling: In a large skillet, heat 1 tablespoon butter and 1 tablespoon oil over medium-high heat. Add chopped onions, and cook until translucent. Add mushrooms; season with salt and pepper. Cook until the mushrooms have released all of their liquid and it has evaporated. Stir in parsley. Transfer to a small bowl; set aside.
3. Place one piece of steak on work surface. Spoon one-sixth of the filling onto the center of the steak. Sprinkle with one-sixth of the breadcrumbs. Roll up steak to enclose filling. Tie each end with a piece of kitchen twine. Repeat with remaining steak, filling.
4. In the same large skillet, heat 2 tablespoons olive oil and 2 tablespoons butter. Add roll-ups, and cook until browned on all sides, about 4 minutes. Transfer roll-ups to a baking dish just large enough to hold them in a single layer.
5. In a small saucepan, heat remaining tablespoon butter and remaining 2 tablespoons olive oil over medium-high heat. Add garlic and sliced onions. Cook until onions are translucent, about 2 minutes. Stir in tomato sauce and wine. Cook until heated through. Pour over roll-ups and bake, covered, until tender, about 1 1/4 hours. Remove twine, and serve with grated beets and buckwheat groats.