Stir-Fried Choy Sum with Ginger and Garlic

Name: Stir-Fried Choy Sum with Ginger and Garlic (Chao Cai Xin 家常炒菜心)
Cuisine: Chinese
Ingredients: 2 tbsp cooking oil; 275 g choy sum; ¼ tsp caster sugar; Salt; 2 garlic cloves, peeled and sliced; 10 g ginger, peeled and sliced