Remove the outer leaves from the lemongrass, and tap the stalk with the back of a knife. Peel and finely chop the ginger. Heat the oil in a pot. Fry curry paste, lemon grass and ginger in it. Deglaze with coconut milk and broth, bring to the boil and reduce to about 600 ml, stirring occasionally
Wash coriander, dab dry, pluck leaves from the stems and chop. Mix starch and 1 teaspoon curry powder with a little water. Boiling broth with it, season to taste with salt, curry powder and 2-3 teaspoons lime juice. Stir in coriander. Remove lemon grass from the stock. Pour sauce into a sauce boat and serve
Tastes great with fried rice or vegetables