Mulligatawny is a filling, lightly spiced soup. It is a feature of Anglo-Indian cuisine, with influences from both the British and the Indian cuisines.
Heat the oil in the pressure cooker on medium-low heat, then add the onions and sprinkle with the salt. Stir and cook for ten minutes or until the onions are lightly coloured.
Add ginger and garlic and fry for two minutes or until the raw garlic smell has gone.
Add celery, carrot and apple, stir to combine, then fry, stirring often for five minutes until vegetables start to soften.
Add the rasam masala and turmeric and stir for another minute to release flavours and aroma.
Add the lentils, tomatoes and jaggery then mix well.
Add tamarind water and stock, mix well and seal the pressure cooker. Cook on low heat for 15 minutes, then release pressure naturally.
Using the hand blender, process the soup to a smooth puree. Return to the heat and add the coconut milk. Mix well. Do not allow the soup to boil, as this will cause the coconut milk to separate.
Taste and adjust seasoning as required. You may need a little more salt to bring out the other flavours.
to serve
Place half a cup of cooked rice at bottom of each bowl, ladle over the soup, garnish with chopped tomatoes and a generous sprinkling of coriander leaves. Serve.
notes
This can be done on the stovetop but will take around an hour longer to cook.
You can substitute curry powder for rasam masala. This is the way the re-patriated British made this dish.
Natural release on a pressure cooker means to remove from heat and allow the temperature and pressure to subside without opening the release valve.