For the broth, wipe the kombu clean and warm it with the water at 80 ˚C for an hour.
Take out the kombu and keep it for other purposes.
Cut the vegetables in brunoise, add the vegetables to the kombu water and cook for 30-40 minutes.
Make a paste of shrimp shells, garlic, ginger, galangal, sambal and the lemongrass stalks.
Fry until fragrant and add to the broth.
Boil for ten minutes.
Strain and add the cream and chaat masala.
Boil for ten minutes and then cool it down.
Add mixed herbs before serving.
Bring to the boil and leave to infuse for at least ten minutes.
Season to taste with lime juice and tomato anti-boise.