Combine Wine, Lemon Juice, Salt And Pepper. Marinate Beef In This Mixture For 30 Minutes, Turning Frequently. Remove Beef, Reserve Marinade. Saute Onion In Oil For 5 Minutes. Add Beef And Saute Until Well Browned About 15 Minutes. Pour Marinade Over Beef And Simmer For 30 Minutes. Serve With Rice, Potatoes Or Noodles.