-1/4 cup soy sauce -2 tablespoons calamansi or lemon juice -1 pound beef sirloin, cut into 1/4-inch thick slices -freshly ground black pepper -vegetable oil -1 medium onion, cut into 1/4-inch thick rings -4 medium potatoes, cut into 1/4-inch slices
Marinate beef in soy sauce, calamansi and freshly ground black pepper. Refrigerate overnight.
Before cooking the beef let it rest at room temperature for over an hour. Do not discard marinade but set aside. Fry steaks in oil in a pan over medium to high heat until almost done. Transfer beef and pan juices to a plate and set aside.
Add more oil to the pan, if needed, and fry onion rings until tender and browned. Set aside. Add more oil, if needed, and fry potatoes until cooked through. Set aside.
Add the marinade to the pan and bring to a boil. For a thicker sauce, simmer and reduce until desired thickness is reached. Add steaks, onions, and potatoes back to the pan and toss a few times. Serve hot with cooked rice.
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