Chinese Broccoli (Gai Lan): How to Cook It Right

By Elena Ignacio · Updated June 2024

Adam told me gai lan and broccoli weren't the same thing. He was seven. He was right.

He had been eating gai lan at his school canteen in Singapore since 2021, stir-fried with oyster sauce pooling at the plate edge. He came home one evening and asked why we never had it. I said we had broccoli. He looked at me with complete seven-year-old certainty and said, “That’s not the same thing.” I spent the next two weeks discovering he was right. Part of that time I served gai lan slightly yellow to Alfi, who pushed it to the side of his plate without a word.

Here is what I learned.

What's the difference between gai lan, regular broccoli, and broccolini?

Regular broccoli grows a large central head. Gai lan has almost none of that. It is a long stem with flat dark leaves and tiny buds at the top. The bitterness is different too: regular broccoli is mild and nutty; gai lan sits closer to broccoli rabe but gentler.

Broccolini is a hybrid of gai lan and regular broccoli, developed in Japan in the 1990s. Those long-stemmed bunches that cost more than you expect at the supermarket? That is broccolini. It looks like gai lan but tastes milder and sweeter. Not the same vegetable.

How do I pick good gai lan at the supermarket?

Dark blue-green leaves. No yellowing. Tight, compact buds at the top. If the buds have opened into white or yellow flowers, the bunch is past its peak and will taste more bitter.

Thinner stems mean younger gai lan, which is more tender. Baby gai lan, sold at some Singapore supermarkets, is the most delicate. Avoid bunches with limp leaves or dry-looking cut ends.

What does gai lan taste like?

Slightly bitter, mildly peppery, clean. Not as sharp as broccoli rabe. Not as neutral as bok choy. Cooking softens the bitterness. The stems turn sweet and almost buttery when blanched properly. The leaves wilt into something silky.

What's the best way to cook gai lan?

Two methods. Blanching is the classic dim sum approach. Stir-frying gives more flavour from garlic and sauce. I do both.

How long does gai lan take to cook?

The moment gai lan turns yellow, it is overcooked. Stems should be bright green and tender but not soft. Leaves wilted but not collapsed.

Is gai lan healthy?

Yes, practically.

Gai lan is cruciferous, like broccoli, cabbage, and bok choy. Cruciferous vegetables contain glucosinolates that convert to sulforaphane when you chop or chew them. Research suggests these compounds may support cellular health, though the evidence is for whole vegetable consumption over time, not a single serving (MD Anderson Cancer Center, “Cruciferous Vegetables and Cancer Prevention”).

The calcium surprised me. Gai lan provides around 105 mg calcium per 100g vs 47 mg in regular broccoli (USDA FDC comparison). More than twice the calcium. For two boys who don't drink much milk, that landed. Vitamin C is around 45 mg per 100g (USDA FDC).

One practical note: chopping gai lan and waiting a few minutes before cooking activates the myrosinase enzyme, increasing sulforaphane production. Heat above 70°C slows this enzyme, so a brief blanch preserves more activity than long boiling (Bhupathiraju & Tucker, Clin Chim Acta, 2011; PubMed 2020). Cut it, wait a few minutes, cook it fast.

How do I store gai lan and what can I substitute?

Wrap in a damp paper towel, store in an open bag in the crisper. Stays good for 3 to 4 days. Wash right before cooking, not before storing.

When gai lan is not available: broccolini is the closest substitute in flavour and structure. Choy sum works for the blanch-and-oyster-sauce method. Bok choy is a fallback but has a different texture and more water content.