Mom's Best Recipes
Recipe

Xiao Long Bao (Siu Long Bao)

A home-kitchen version of the classic soup dumpling: savory pork filling plus chilled broth that melts into soup as it steams.

Author By Matt Campbell
4.8
A bamboo steamer basket filled with freshly steamed siu long bao soup dumplings lined on parchment, with a small dish of black vinegar and ginger on the side on a warm kitchen table

Siu long bao is one of those foods that feels like a magic trick you can eat. You pick up a little dumpling, somehow there is soup inside, and your brain does a quick reboot mid-bite.

This is the home-cookable version. No fancy specialty equipment required, no rare ingredients, and I am going to be very honest about the two things that matter most: gelatinized broth (aspic) and thin wrappers that stay sealed. Do those right, the rest is just a very satisfying folding project.

A stainless steel mixing bowl on a kitchen counter with ground pork filling mixed with scallions and ginger, a wooden spoon resting inside

Why It Works

  • Real soup inside thanks to a quick pork-chicken broth set with gelatin, then diced and mixed into the filling.
  • Juicy, seasoned pork that stays tender because we mix until tacky and add a little liquid for bounce.
  • Wrappers that cooperate with a simple hot-water dough and a rolling method that keeps edges thin and centers slightly thicker.
  • Steaming that does not sabotage you with parchment liners, steady simmering water, and a rest time so dumplings release cleanly.

Pairs Well With

Storage Tips

Storage Tips That Actually Work

Siu long bao is at its peak right after steaming, but you can absolutely prep ahead.

Unsteamed dumplings (best option)

  • Freeze on a tray: Place assembled dumplings on a parchment-lined sheet pan, not touching. Freeze until solid, 1 to 2 hours.
  • Bag them up: Transfer to a freezer bag or airtight container. Freeze up to 1 month for best texture.
  • Steam from frozen: Do not thaw. Add 2 to 4 extra minutes of steaming.

Leftover aspic

  • Keep chilled in an airtight container up to 4 days. Dice right before using so it stays clean and firm.

Steamed leftovers

  • Reheating is tricky because the wrappers can go tough. If you must, re-steam gently for 3 to 4 minutes or microwave under a damp paper towel in short bursts. The soup may leak, but it will still taste good.

A parchment-lined baking sheet holding uncooked siu long bao arranged in rows, lightly frosted from the freezer on a home kitchen counter

Common Questions

Common Questions

What is siu long bao?

Siu long bao, also written xiao long bao, is a Shanghai-style soup dumpling. The “soup” comes from gelatinized broth (aspic) that melts when steamed.

How do you get soup inside the dumplings?

You make a concentrated broth and set it with gelatin. Once chilled, it becomes a firm gel you can dice and mix into the pork filling. During steaming, the gelatin melts back into broth.

Do I need a bamboo steamer?

No, but it is helpful. Any steamer setup works: a metal steamer basket, a stacked steamer pot, or a steamer insert. The key is lining it so the dumplings do not stick and keeping the water at a steady simmer.

Why did my soup dumplings leak?

  • Thin spot or tear: Patch with a tiny piece of wrapper and water, then pinch closed.
  • Not sealed well: Aim for tight pleats and a firmly pinched top knot.
  • Over-steamed: Too long can weaken wrappers. Steam just until the dough looks slightly translucent and puffed.
  • Dumplings stuck to the liner: Use parchment with holes or a lightly oiled cabbage leaf. Let them rest 1 minute after steaming before lifting.

Can I use store-bought wrappers?

If you can find thin soup dumpling wrappers specifically, yes. Standard dumpling wrappers are usually too thick and can feel bready. Homemade is worth it here because you can roll the edges thinner than any package will.

My aspic is too soft to dice. Now what?

It happens. Gelatin brands and bloom strength vary. If your aspic is more “wobbly” than diceable after a full chill, remelt it gently and whisk in 1 to 2 more teaspoons gelatin (bloom it first), then rechill until firm.

How do you eat siu long bao without burning your mouth?

Place one dumpling on a spoon. Nibble a small hole, sip the broth, then dip in black vinegar with ginger and finish the dumpling. Basically: respect the soup.

A single siu long bao sitting in a soup spoon with a small bite taken out, steam rising, with black vinegar and julienned ginger in a dipping dish nearby

The first time I tried making siu long bao, I thought it was going to be one of those “cute weekend projects” that ends with a photogenic plate and a little personal growth. What I got instead was dumpling chaos, a few soup explosions, and a new respect for anyone who can fold 18 pleats without blinking.

But once you taste that first successful one, the one that actually holds soup, it is hard not to go back. This recipe is how I make it now: accessible ingredients, clear steps, and a little permission to be imperfect. Because even the leaky ones are still dumplings filled with gingery pork and broth, and that is not exactly a tragedy.