Wash and cut the flask into thirds. Wash the peas and cut into small pieces. Clean the spring onions and cut into rings. Peel the ginger and pound it in a mortar (or chop it very finely). Wash the lemongrass and beat it with a mortar (or with a knife handle).
Heat the oil in a frying pan and briefly fry the vegetables including the ginger. Add a few dashes of lime juice and deglaze with 800 ml of water. Briefly bring to the boil. Add the bouillon powder and turmeric and cook for 5 minutes. Dissolve coconut milk powder in the remaining water and pour in. Let the soup simmer on a low heat for 20 minutes. Before serving, remove the lemongrass stalks (too tough to eat).
Tip: Possibly spice up a little with chili powder or curry powder or salt with soy sauce.