Mix the soy sauce, calamansi (or lemon) juice, garlic and pepper, add the meat, cover and refrigerate for at least 1 hour.
In a pan, fry the onion rings over high heat in 1 tbsp oil for 2-3 minutes, until slightly softened but still holding their shape; remove.
Remove the meat from the marinade (reserve the marinade), and fry in the remaining oil over high heat, in batches, 1 minute per side.
Return all the meat, pour in the marinade, water and sugar, bring to the boil, and simmer covered over low heat for 10-15 minutes, until the meat is tender and the sauce has thickened slightly.
Top with the onion rings, heat through together for 1-2 minutes, and serve with rice.
A Receptnaptár original recipe. Calories and protein are estimated.
Tips
Calamansi is a small, sour Filipino citrus; its frozen juice is sold at Asian grocers.
The meat should be very thin, so it turns tender with even a short braise.
Don't overcook the onion; the crisp-tender rings define the dish.