A light and soothing South Indian lentil broth infused with fresh mint, cracked black pepper, and tangy lime. It delivers a vibrant, peppery heat balanced by herbaceous and citrusy notes.
Combine 100 g toor dal, the dal spices, and 250 ml water in a pressure cooker and cook under pressure for 5 minutes, or simmer in a covered saucepan for about 25 minutes until completely tender.
Place 100 g mint, 12 g green chilli, the paste spices, and 30 ml water into a blender and blitz until smooth.
Transfer the cooked dal to a pot, pour in 500 ml water, and whisk thoroughly. Stir in the blended mint paste and season with salt to taste. Bring to a boil over high heat, adding a splash more water if the broth is too thick, then lower the heat and simmer for around 5 minutes until frothy.
Take the pot off the heat and stir in 22.9 g lime juice.
Melt 8.8 g ghee in a small pan set over medium heat. Add 1 g curry leaf along with the tempering spices and fry for about 1 minute until the mustard seeds begin to pop.
Pour the hot spiced ghee into the rasam, stir through, and scatter 2 g coriander leaf over the top before serving hot.
Steep a tiny pinch (0.1 g per 2 g turmeric) in 2 tbsp warm water; use to match the rich golden hue. Contributes an aristocratic, honeyed floral flavour rather than earthy bitterness.
Use about 30% of the weight of fresh mint. Rub between your palms to crush before stirring in; the flavour will be more intensely herbal and less bright.
Use 120% of the weight; melt gently over low heat to avoid burning the milk solids, which will yield a softer, creamier richness rather than a nutty aroma.
Use the same weight. The seeds are smaller and hotter; fry in hot oil until they pop, about 20–30 seconds, and reduce the heat if they darken too fast. The dish will be a little sharper.
Use 70% of the weight of whole seed, added with the other ground spices rather than fried whole. You lose the popping texture and the heat comes through more evenly.