In a small bowl, mix oyster sauce, light soy sauce, sugar, and water until combined. Set aside.
Heat oil in a wok over medium-high heat. Add chopped garlic and stir-fry until fragrant.
Add the sliced beef and cook for 1–2 minutes until just starting to brown.
Add the cauliflower florets and continue stir-frying for another 2–3 minutes.
Pour in the sauce mixture and toss well. Add the sliced chilies and stir to coat everything evenly.
Cook for another 1–2 minutes until the cauliflower is crisp-tender and the sauce thickens slightly. Serve hot with rice.
Notes
Use the nutrition card in this recipe as a guideline.
Store leftovers in an airtight container in the fridge for up to 3 days. Reheat in a hot pan or the microwave until steaming hot. Add a splash of water if it seems dry.