1 1/2 lb. sirloin
1 big onion, sliced crosswise
1 tbsp. lemon juice
3 tbsp. soy sauce
1 tbsp. sugar
3 tbsp. oil
1/2 c. water

Keep meat partially frozen and slice into very thin strips. Combine lemon juice, soy sauce and sugar. Pour mixture over beef slices and marinate for at least 30 minutes. Saute onion in hot oil until transparent. Transfer to a platter.

Drain beef. Fry in the same skillet over medium heat a few slices at a time until brown on both sides. Transfer to platter. Pour off excess oil, add marinade and 1/2 cup water. Simmer for 3 to 4 minutes, scraping off browned bits in the skillet. Pour this sauce over meat and sauteed onions on platter. Serve hot with steamed rice.