Rau Muống Xào Thịt Bò (Vietnamese Sautéed Morning Glory With Beef) Recipe

No Vietnamese meal would be complete without a plate of greens, and often, it’s rau muống xào (sautéed morning glory) you’ll see on the table. There are many variations, but the most common is with garlic, which can stand alone as the most basic flavoring, or act as a foundational note to support other flavorings and add-ins. One of my favorite ways to add some heft to this simple dish is to toss in a little bit of beef to make rau muống xào thịt bò (sautéed morning glory with beef).

Affordable and versatile, morning glory (rau muống) is a prized vegetable both inside and outside of Vietnam. It goes by kangkong in Singapore and the Philippines, and kangkung in Malaysia. In North America, it’s commonly known as ong choy (its Cantonese name), as well as water or river spinach (despite bearing no relations to the spinach family—indeed, it is the stems of the morning glory flower that is grown as a popular ornamental plant). This vining aquatic plant with hollow stems and slender pointed leaves is cultivated widely and can grow at a rapid speed of four inches a day. 

Its mild vegetal note, tender leaves, and crisp stems make it a perfect candidate for stir-frying, as it readily takes on the flavors it’s cooked with, whether it’s fermented shrimp paste, sambal, or oyster sauce. Besides stir-frying, it can be boiled (its cooking liquid repurposed into a soup), slipped into a salad, or pickled. The raw stems can be shredded into fine threads to garnish noodles and hot pots. In folkloric poems, a bowl of morning glory soup evokes nostalgia and homesickness.

My version of rau muống xào thịt bò starts with making the crispy garlic sprinkles that top the dish, an innovation I learned from the Oakland-based chef Tu David Phu. Then I use the garlic-infused oil to quickly sear the beef and set it aside before continuing with the greens.

There are a couple possible ways to go about this stir-fry. Some recipes call for blanching the greens (stems and leaves) and then shocking them in an ice bath before stir-frying. This approach has the advantages of pre-wilting the morning glory for quicker stir-frying later and locking in its vibrant green color. The other is to give the thicker stems a kick-start in the hot pan, given their slightly longer cooking time, then adding the more delicate leaves. 

Testing both methods side-by-side, my husband and I preferred the two-stage cooking process, which started with stir-frying the stems in half of the sauce (a mixture of soy sauce, oyster sauce, and water) until they softened slightly, followed by the leaves and the remaining sauce. Compared to the blanched batch, this yielded more flavorful greens and retained the contrasting texture of crunchy stems with tender leaves—not to mention that no additional pot or colander was needed, a definite bonus. As with other stir-fries, the key is to get all of your ingredients ready and within reach before cooking, and work quickly once cooking has started. 

Normally, a vegetable stir-fry is part of a meal with multiple dishes, and its more reserved flavor profile makes it a good counterpart to more boldly flavored dishes on the table, but with the added beef and served with some steamed rice, this is substantial enough on its own.