Banh Chung: Square Sticky Rice Cake for Tet

Why banh chung matters at Tet

"Banh chung" is the non-negotiable centerpiece of the Vietnamese Lunar New Year altar. Square, heavy, green-wrapped, and filled with sticky rice, mung bean, and pork — if your family doesn't make or buy at least a pair of these for "Tet", you're doing it wrong. The name "chung" means steaming, though you actually boil them for hours (sometimes 10-12 hours straight). The square shape represents Earth; the round "banh giay" cake represents Heaven. Together they honor ancestors and the natural world that sustains Vietnam's wet-rice culture.

The legend of Prince Lang Lieu

Banh chung's origin story is one of the few Vietnamese food legends that every kid learns in school. Prince Lang Lieu, the 18th son of the 6th Hung King, was poor — his mother had died, his household was small. When the king announced a contest to choose an heir based on the best offering to the ancestors, Lang Lieu's twenty-one brothers went hunting and trading for exotic delicacies. Lang Lieu had no money for that.

One night he dreamed of a divine being who told him: "Nothing is more precious than rice. Pound glutinous rice into a round cake for Heaven, wrap it in leaves into a square cake for Earth, with a savory filling inside — this will show filial piety." Lang Lieu woke up and got to work. He selected pristine glutinous rice, wrapped it in green leaves with a mung bean and pork filling, and boiled it into square cakes (banh chung). He also made round cakes from pounded sticky rice (banh giay).

When the princes presented their offerings, the king tasted Lang Lieu's simple cakes and declared them superior to all the mountain-and-sea delicacies. He used them to worship the ancestors, decreed that Vietnamese families should make them every Tet, and passed the throne to Lang Lieu. The festival was even called "Tet Lieu" after him for a time.

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What goes into a proper banh chung

Wrapping leaves: Fresh "la dong" (phrynium leaves) are the standard. You want young, large, uniform, unripped leaves with a vibrant green color. Some regions use "la chit", banana leaves, or even "la bang" if dong leaves are unavailable.

Ties: Thin bamboo strips called "lat giang", soaked in saltwater or steamed to soften them. You'll need strong hands — tying banh chung tight enough that it holds its shape through 10 hours of boiling is an art.

Glutinous rice: Rice from the main harvest, ideally "nep cai hoa vang" or highland varieties. The grains should be large, round, consistently sticky, and fragrant when fresh.

Mung beans: The best come from the midland hills of Thanh Hoa, Nghe An, Ha Tinh, Phu Tho — fragrant and crumbly when cooked. After harvest, they're sun-dried, winnowed clean, and stored in ceramic jars.

Pork: Pork belly ("thit ba chi") from traditional "lon i" pigs raised on natural bran and vegetables, no growth hormones. The fat-to-lean balance keeps the filling rich and moist. Do NOT use fish sauce to marinate the pork — it causes the cake to spoil faster. Just salt and black pepper.

Spices: Black pepper, salt. In old Hanoi, some families used cardamom or "ca cuong" essential oil in the filling, but that's rare now.

Color: The green tint comes from placing the darker side of the dong leaf against the rice. Some cooks add pandan leaf or galangal juice for aroma and a jade-green color. Commercial vendors have been caught using battery acid in the boiling water to force a brighter green — don't do that. Home cooks report that a galvanized iron pot (not aluminum) helps achieve good color safely.

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How to eat banh chung

On the Tet altar, banh chung and banh giay appear in pairs. Some families remove the outer leaves, rewrap the cakes in fresh leaves, and tie them with red string before offering. When it's time to eat, cut banh chung diagonally using the same bamboo string it was tied with — this ensures every piece has an even amount of filling. Or cut it horizontally, which gives the middle slices more filling.

Serve with pickled onions ("dua hanh"), fish sauce, or soy sauce with a little pepper. After Tet, when the cake hardens, pan-fry slices in oil until golden and crispy. Eat with pickled vegetables and "gio lua" (Vietnamese pork sausage) to cut the richness.

In Thanh Hoa, Nghe An, and Ha Tinh, people dip banh chung in molasses. A folk rhyme: "Peel the banh chung / For the teacher to dip in molasses."

Banh chung dai (long banh chung)

In the midland and mountain provinces — Phu Tho, Vinh Phuc, Bac Ninh, Bac Giang, parts of Hanoi — the square banh chung is mostly reserved for ceremonial offerings. Daily eating favors the long, cylindrical version called "banh chung dai" or "banh tay". Same ingredients, different shape. Cut it into horizontal slices called "dong banh."