Wash the greens thoroughly. Trim the ends if needed, then separate the stems from the leaves and set aside.
1-2 lb water spinach/morning glory
In a small bowl, prepare the sauce by mixing the oyster sauce and sugar until combined.
1.5 Tbsp oyster sauce, 1 tsp sugar
Heat oil in a large skillet or wok over medium-high heat. Add the minced garlic and sauté for about 1–2 minutes until fragrant.
2 Tbsp garlic
Pour in the prepared sauce and stir for about 30 seconds to allow the garlic and sauce to combine.
Add the water spinach stems first, stir-frying for about 30–45 seconds, then add the leaves and continue stir-frying for 1–2 minutes until they begin to wilt.
Add 1 tablespoon of water, cover the pan, and allow the vegetables to steam for about 2 minutes until tender but still vibrant.