Prep the beef: Freeze the beef for 30–45 minutes until firm. Slice thinly against the grain, about 1/8 inch thick.
This helps tenderness and quick cooking.
Make the marinade: In a bowl, mix soy sauce, vinegar (or calamansi), brown sugar, garlic, pepper, optional oyster sauce, and a pinch of salt if needed. Taste and adjust sweetness or acidity.
Marinate: Add sliced beef to the marinade and toss to coat. Cover and refrigerate for at least 4 hours, preferably overnight.
For maximum flavor, marinate 12–24 hours.
Drain and pat dry: Before cooking, drain the beef and pat lightly with paper towels. This helps with browning and prevents steaming.
Cook the tapa: Heat oil in a large skillet over medium-high. Spread beef in a single layer.
Sear 1–2 minutes per side until browned and slightly caramelized. Work in batches to avoid overcrowding.
Optional saucy version: After browning, add a few tablespoons of water to the pan to deglaze and create a glossy glaze. Reduce until it lightly coats the beef.
Make the garlic rice: In a separate pan, sauté minced garlic in oil until golden.
Add day-old rice and toss with salt and pepper. Cook until heated through and fragrant.
Fry the eggs: Cook sunny-side up with set whites and runny yolks. Season lightly with salt and pepper.
Plate your tapsilog: Serve beef tapa with garlic rice and eggs.
Add tomato slices, atchara, and a squeeze of calamansi or lemon if you like.