Soak the beans overnight in about 1 1/2 litres of cold water. Cook the beans with soaking water for 45-60 minutes. Mix tamarind paste with 3 tbsp. hot water
Clean, wash and cut the okra pods into pieces. Boil up about 300 ml water and lemon juice. Simmer the okra pieces for about 5 minutes, drain and rinse in cold water. Peel carrots, cut them in half lengthwise and cut them into thin slices.
Peel and finely chop the garlic, ginger and shallots. Wash and clean the tomatoes, chop them coarsely and mash them finely. Heat the oil in a pot. Roast mustard seed and cumin for about 1/2 minute. Add shallots and garlic and continue roasting over medium heat for 1-2 minutes. Add the remaining spices and curry leaves and fry briefly. Deglaze with tomato puree and tamarind, simmer for about 2 minutes. Add stock, add carrots and pods and simmer for 5-6 minutes until the carrots are done. Season soup with salt
To serve, stir soup again so that floating spices sink to the bottom. If necessary, skim off spices with a small sieve. Serve rasam with e.g. boiled water rice (wild rice)
Waiting time approx. 12 hours