Tantanmen (Tan Tan Ramen)

Name: Tantanmen (Tan Tan Ramen)
Prep time: 5 min
Cook time: 10 min
Total time: 15 min
Cuisine: Japanese
Ingredients: 30 g green onion(s) (white part); 1 tsp sesame oil; 150 g ground pork (see note for vegetarian option); 1 pinch salt and pepper; 1 pinch sugar; 1 dash soy sauce; 1 tsp grated ginger (or ginger paste); 1 tsp grated garlic (or garlic paste); 1 tbsp chili bean sauce ((tobanjan)); 4 tbsp white sesame paste ((nerigoma) or smooth peanut butter); 2 tsp ground sesame seeds; 2 tbsp tsuyu sauce (or soy sauce); ½ tsp rice vinegar; 2 tsp chili oil; 4 tsp Chinese-style chicken bouillon powder (see note for vegetarian option); 600 ml water; 2 portions ramen noodles; 100 g pak choi; 2 tbsp green onion(s) (green part, finely sliced to garnish); chili oil