Bistek Tagalog

Combine soy sauce, calamansi juice (or lemon and orange juices) and garlic in a medium bowl. Add beef and toss to coat. Cover and refrigerate for at least 1½ hours and up to 4 hours.

Heat oil in a large skillet over medium-high heat. Add onion and cook, stirring, until soft and lightly browned, about 5 minutes. Using a slotted spoon, transfer the onion to a bowl.

Remove the beef from the marinade (reserve the marinade) and add to the skillet. Cook, stirring, until no longer red, about 2 minutes. Add the reserved marinade and water. Bring to a boil, then reduce heat to medium-low, cover and simmer for 30 minutes. Remove the lid and continue cooking until the liquid has reduced by half, about 20 minutes more. Stir in the cooked onion and season with pepper to taste. Serve hot, over rice if desired.