Peas with Dried Shrimps

Name: Peas with Dried Shrimps (Hui Jin Gou Qing Wan 燴金鉤青丸)
Cuisine: Chinese
Ingredients: 1 tsp potato flour mixed with 1 tbsp cold water; 2 tbsp dried shrimps; 1 tsp sesame oil; 250 g podded peas (defrosted frozen peas are fine); 2 spring onions, white parts only; 25 g piece of ginger, unpeeled; 2 tbsp cooking oil; Ground white pepper; Salt