Marinade beef in calamansi, soy sauce, pineapple juice, black pepper and garlic. Cover container in plastic wrap and let the mixture in the refrigerator for 2-3 hours.

In a wok over medium heat, saute garlic until cooked.

Add marinated beef and cook until juices come out.

Add remaining marinade to the wok.

Reduce heat to medium-low and simmer beef until soft and tender.

Add salt & pepper. Combine all ingredients.

Add onion rings and simmer until onions are caramelised.

Serve and enjoy!