Photo: Sara McCleary (CC BY-SA 4.0) via Wikimedia Commons · source
The easiest dim sum to make at home: no pleating, just a wrapper cupped around a bouncy pork and shrimp filling. Store-bought wrappers are what most dim sum kitchens use too.
150 g (1/3 lb) raw shrimp, peeled and roughly chopped
4 dried shiitake mushrooms, soaked in hot water 30 minutes, stems removed, finely diced
1 tbsp light soy sauce
1 tbsp oyster sauce
1 tsp Shaoxing wine
1 tsp sugar
1/2 tsp salt
1/4 tsp white pepper
1 tbsp cornstarch
1 tsp sesame oil
1 tsp grated ginger
24 round or square wonton (siu mai) wrappers, thin yellow ones if you can find them
2 tbsp finely diced carrot or fish roe, to garnish
To serve: chili oil and soy sauce
How to make it
Make the filling (10 min): Combine pork, shrimp, shiitake, soy, oyster sauce, wine, sugar, salt, pepper, cornstarch, sesame oil and ginger. Stir hard in one direction for 2 minutes, then throw the mixture against the bowl a few times; this is what makes it springy. Chill 15 minutes.
Trim the wrappers (2 min): If square, trim the corners off to make rough circles.
Shape (15 min): Make an O with your thumb and forefinger and set a wrapper over it. Put a heaping tablespoon of filling in the middle and gently push it down through the O, squeezing the sides so the wrapper pleats naturally around a cylinder of filling. Flatten the top with a wet spoon and tap the base on the board so it stands.
Garnish (1 min): Dot the top of each with a pinch of carrot or roe.
Steam (8 min): Set on parchment in a steamer, 2 cm apart, and steam over boiling water for 8 minutes until the filling is firm and cooked through (71C/160F inside).
Serve: Hot, with chili oil and soy.
Tips
Freeze shaped siu mai on a tray and bag them; steam from frozen for 12 minutes.
Fattier pork makes juicier siu mai; lean pork turns dry.