Ingredients:
60 g (2 oz) butter
1 pound top sirloin or tenderloin, cut into 1-inch wide by 2 1/2-inch long strips
salt, pepper
2 tomatoes, peeled and diced
1 large onion, chopped
200 g (7 oz) mushrooms, sliced
lemon juice
1 tsp. mustard
2 pickled cucumbers, diced
1/8 l (1/2 cup) sour cream at room temperature (to prevent curdling)
Preparation:
- Melt oil and butter in pan. Add beef to pan. When beef is browned, season with salt and papper and remove it from the pan.
- Add tomatoes, onion and mushrooms and sauté until done. Add lemon juice, mustard and cucumbers and simmer for five more minutes. Add sour cream; do not let it come to a simmer or boil or the sour cream will curdle.
- Add browned beef.
- Serve over cooked egg noodles, rice or baked potatoes.

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