Not far from my home there is a Chinese takeaway which sells pretty good dim sum dumplings. All I have to do myself is prepare the right dipping sauce. Classic and simple is a soy based ginger dipping sauce. I like this sauce for pork shumai (烧卖) dim sum.

Ingredients for soy ginger sauce:
2 tbsp light soy sauce.
1 teaspoons minced ginger.
A pinch of white pepper.
Sesame oil to taste.

Alternatively you can serve a dipping sauce with black vinegar for Xiaolongbao (小籠包) dim sum.

Ingredients for Xiaolongbao (小籠包) sauce:
1 tablespoon light soy sauce.
3 thin slices of julienned ginger.
1 teaspoon black vinegar.

For shrimp dumplings har gaw (蝦餃) you need a lighter sauce without soy sauce.

Ingredients for ginger and rice vinegar sauce:
2 teaspoon ginger chopped finely.
1 ½ tablespoon rice vinegar.