In a large mixing bowl, combine 3 cups all-purpose flour and 1/2 tsp salt. Pour 1 cup boiling water into the flour in a thin stream while stirring with a wooden spoon or chopstick until the mix looks like coarse crumbs and starts to clump. Let cool for 5 minutes.

Knead

Add 2 tablespoons cold water and 1 tablespoon vegetable oil. Mix until a shaggy dough forms, then turn onto a lightly floured surface and knead for 6–8 minutes until smooth and elastic. If dough is sticky, dust lightly with flour; if too dry, add 1 teaspoon water at a time.

Rest

Shape dough into a ball, coat lightly with 1 teaspoon oil, cover with plastic wrap or a damp towel, and let rest for 30 minutes at room temperature to relax the gluten (this makes rolling easier).

Divide and roll wrappers

After resting, divide the dough into 30–36 equal pieces (about 20–25 g each). Roll each piece into a small ball. Using a rolling pin, flatten each ball into a 3- to 3.5-inch round wrapper about 1.5 mm thick. Keep finished wrappers covered with a damp towel to prevent drying.

Pork & Shrimp Filling (makes ~30-36 pieces)

Prep ingredients

Finely chop shrimp into small pieces (still slightly chunky). Rehydrated shiitake mushrooms should be finely chopped. Finely slice green onions; separate white and green parts if desired.

Mix filling

In a large bowl combine 1 lb ground pork, 8 oz chopped shrimp, 3 oz chopped shiitake mushrooms, 2 tbsp diced bamboo shoots (if using), 4 stalks finely chopped green onion (reserve some green for garnish), 1 tbsp grated ginger, and 1 tsp minced garlic.

Season and bind

Add 2 tbsp light soy sauce, 1 tbsp oyster sauce, 1 tbsp Shaoxing wine, 1 tsp sesame oil, 1/2 tsp sugar, 1/4 tsp white pepper, 1/2 tsp salt (adjust to taste), 2 tsp cornstarch and 1 egg white. Fold and mix in one direction (push and smear against bowl) for 1–2 minutes to achieve a tacky, cohesive texture—this helps filling hold together when steamed.

Chill

Cover filling and chill in the refrigerator for 15–20 minutes. Cold filling is easier to handle and forms better in wrappers.

Assembly & Steaming

Assemble dumplings

Place a wrapper in your palm or on a lightly floured surface. Spoon about 1 tablespoon (heaping) of filling into the center. Moisten the wrapper edge with a little water. Fold into desired shape: simple half-moon, pleated purse, or stand-up siu mai style. For siu mai: place wrapper on palm, put filling in center and press open top, leaving filling exposed and garnish with a small dot of chopped green onion or carrot.

Prepare steamer

Line a bamboo or metal steamer with cabbage/lettuce leaves or lightly oil the trays to prevent sticking. Bring 4 cups water to a simmer in the steamer pot (or wok).

Steam

Arrange assembled dumplings in the steamer leaving space between pieces (they will expand slightly). Steam over medium-high simmer for 7–9 minutes (for pork & shrimp filling) until wrappers are translucent and filling reaches 165°F (74°C). For larger or denser dumplings, steam up to 10–12 minutes. Avoid over-steaming which makes wrappers gummy.

Finish

Remove steamer from heat. Lightly brush finished dumplings with 1/2 tsp sesame oil to give shine and prevent sticking. Serve immediately.

Dipping Sauce (optional)

Whisk together 1/4 cup soy sauce, 2 tbsp black vinegar, 1 tsp chili oil (optional), 1/2 tsp sesame oil, 1/4 tsp sugar and 1 tbsp finely sliced scallion. Taste and adjust: more vinegar for tang, more chili for heat, or a pinch of sugar to balance.