1 slice per person or 1/2 inch or less thick top round steak

Spread out on cutting board and sprinkle with salt and pepper. In the wider end put a dab of mustard, 1 teaspoon each or more of onion and chopped bacon. Now roll up toward narrow end, tucking in sides. Tie up with sewing thread. Do this with each one.

Put some butter in a heavy saucepan, add the rouladen and fry high until well browned on all sides. Turn down to low, add water for gravy and let simmer for 1 1/2-2 hours. May add tomato paste for flavouring or more onion. Add sour cream to gravy just before serving. Thicken gravy with flour.