1. Melt 2-4 tablespoons of butter in a large pan (that has a lid). Then add the onions, mushrooms and garlic, and saute for a few minutes. Then cover pan, lower heat and simmer until tender (another 5-10 minutes). 2. Remove this mixture from the pan, including all juices, and set aside. 3. Melt the remaining butter in the same pan. Then add the beef strips, and saute until browned. This takes 5-10 minutes. 4. Add the water, stock cubes, salt and pepper, and bring to a boil. 5. Once this boils, cover the pan again, lower heat and simmer 10-15 minutes. 6. Remove lid and add onion-mushroom mixture. 7. Bring to a boil, then reduce heat and stir in sour cream and mustard. 8. Heat until everything is warmed through, but do not boil. 9. Garnish with parsley. ---------------------------------------------------------------------------
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Ingredients