Prep the filling
Cut the Onion in half. Thinly slice one half for the filling and finely chop the other half for the braise. Cut the Dill Pickles lengthwise into four spears, lay out the Beef Top Round slices, and season both sides lightly with Salt and Black Pepper. Spread a thin layer of Mustard over one side of each slice.
Roll the zrazy
Top each mustard-coated beef slice with a strip of Bacon, one pickle spear, and a little of the sliced onion. Roll each piece up tightly from the short side, tucking the ends in as you go so the filling stays enclosed.
Dredge lightly
Coat each roulade in All-purpose Flour, shaking off the excess so you get a thin, even dusting rather than a thick paste.
Heat the pan
Warm the Vegetable Oil and Butter in a wide skillet over medium-high heat until the butter foams and the fat shimmers.
Brown the roulades
Lay the roulades in seam-side down and sear for 3 minutes. Turn them and sear for 3 minutes more, then keep turning until the outside is evenly browned all over. Transfer the browned roulades to a plate.
Braise gently
Add the chopped onion and Carrots to the same pan and cook for 5 minutes, stirring up the browned bits from the bottom. Pour in the Beef Broth and add the Bay Leaf and Black Peppercorns, then nestle the roulades back in, cover, and simmer very gently for 30 minutes. Flip the roulades, cover again, and simmer for 30 minutes more, until the beef is tender.
Finish the sauce
Lift the roulades out to a plate. Let the sauce bubble uncovered for 5 minutes so it thickens slightly, then take the pan off the heat and stir in the Sour Cream until smooth. Remove the bay leaf and any peppercorns you notice, taste the sauce, and add a little more salt or black pepper if it needs it. Return the roulades just long enough to warm through.
Serve hot
Spoon the creamy sauce over the roulades and serve them right away while everything is hot.














