Heat 2 tablespoons of oil in a wok over medium low heat. Cook the ginger slices for 20 seconds. Add the garlic and Chinese sausage. Increase the heat to medium, and cook for a minute or two until the fat in the sausage turns translucent.
Add the onions and snow peas. Mix everything well. Add the Shaoxing wine, white pepper, sesame oil, and salt. Stir-fry everything for 1-2 more minutes. If the stir fry is too dry, add 1 tablespoon of water.
The dish is done once the snow peas are bright green and the onions are cooked, but still have a little bit of crunch.