Saute the onion in 1 tablespoon butter until golden. Remove from pan, add another tablespoon butter and cook the mushrooms, about 5 minutes. Remove from pan.
Flour the steak strips lightly and brown them in the remaining 2 tablespoons butter.
Return onions and mushrooms back into pan; add beef broth and lemon juice.
Simmer for 15 minutes, add the sour cream and heat gently.
Makes about 4 servings.
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