Bistek Tagalog,

Marinate the beef in a mixture of soy sauce, calamansi juice, garlic, and pepper for at least 30 minutes.

Heat oil in a large skillet or wok over medium-high heat.
Add the beef and cook until browned on both sides. Remove from the pan and set aside.

In the same pan, sauté the onions until they are soft and translucent.

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