Mulligatawny Soup: The Indo-British Curry Soup with Red Lentils

Mulligatawny takes its name from the Tamil milagu thanni, literally "pepper water": a soup born in the kitchens of Tamil Nadu, later adapted and popularized by the British during the colonial era, who added meat and cream in various versions. The version presented here stays close to the original spirit — red lentils, curry spices and coconut milk — and follows the same digestive logic as kitchari or our light summer vegetable curry, already published on this site.

Allow about 15 minutes of prep and 30 minutes of cooking for four servings.

Why is this soup considered digestive?

The very name mulligatawny points to black pepper, a warming, carminative spice that kindles agni, the digestive fire. Paired with red lentils — a legume that cooks quickly and digests more easily than green lentils — and spices like turmeric, cumin and ginger, this dish checks every box of a balanced ayurvedic meal: warm, moderately spiced, and liquid enough not to overload digestion.

The mulligatawny soup recipe

For 4 servings, allow 15 minutes of prep and 30 minutes of cooking.

1. Rinse the red lentils until the water runs clear.
2. Heat the ghee in a large pot and sauté the sliced onion and garlic for 5 minutes until translucent.
3. Add the grated ginger, turmeric, cumin and freshly ground black pepper, and stir for 30 seconds to release the aromas.
4. Add the diced carrot, the rinsed lentils, and the vegetable broth.
5. Bring to a boil, skim, then simmer covered for 20 to 25 minutes until the lentils are fully broken down.
6. Add the coconut milk, stir, and heat for another 5 minutes without boiling.
7. Season with salt, add a squeeze of lemon juice, and blend all or part of it depending on the texture you want.
8. Serve hot, with a little fresh chopped cilantro.

The sign of success: a creamy but not thick soup, where the pepper is noticeable without dominating. If it's too thick, thin it with a little hot broth; if it lacks character, add a pinch more black pepper at the end of cooking rather than the start, to preserve its kick.

Why pair black pepper with turmeric?

This pairing isn't just about taste. A landmark study by Shoba and colleagues, published in 1998 in the journal Planta Medica, showed that piperine from black pepper significantly increases the bioavailability of curcumin in healthy volunteers, with a measured rise of up to 2,000% in its blood concentration compared to curcumin alone (see the study on Google Scholar). That's exactly the traditional logic behind this soup, which systematically pairs the two spices — a concrete example of old cooking and modern research converging, echoing our article turmeric in Ayurveda.

Which variations by dosha?

Profile	Adjustments
Vata (dry, chilly)	Double the ghee, add an extra carrot for more sweetness, serve piping hot
Pitta (heat, acidity)	Cut the black pepper in half, replace the lemon with a little grated coconut to soften it
Kapha (heaviness, slow digestion)	Full dose of black pepper, less coconut milk, add a pinch of chili

How to store and serve it?

This soup keeps for 2 to 3 days in the fridge in a sealed container and reheats easily over low heat. It also freezes well, before adding the coconut milk, which is best stirred in just before serving. Serve it on its own as a light evening meal, or with a little basmati rice for a heartier one.

Precautions

This soup is generally well tolerated. Black pepper in culinary amounts is not a problem for most profiles, but people prone to acidity or heartburn (see our article on acid reflux) will benefit from reducing the amount. Coconut milk, rich in plant-based saturated fat, should be enjoyed in moderation for anyone under specific cardiovascular monitoring. If in doubt about a condition or current treatment, consult our safety guide.