India’s most underrated seafood? North Kerala’s kallummakkaya has entered the chat

In North Kerala, one shellfish commands unusual loyalty. It has a dedicated season, a thriving local economy and an entire repertoire of dishes built around it. In Malabar, the obsession is so visible that there is even a marketplace named after it.

In Kozhikode, you will find Kadukka Bazaar, a trading spot that carries the mussel’s name. Regulars insist the kadukka or kallummakkaya (mussels) sold here tastes different, better, fuller. Whether that is terroir or sentiment hardly matters. When a city lends a marketplace its name, you know this is more than just seafood in North Kerala.

The star of this obsession is kallummakkaya, green mussels harvested from Kerala’s rivers and backwaters.

The mussel that became a Malabar icon
Kallummakkaya are green mussels that grow in brackish water, where river meets sea. In North Kerala districts such as Kadalundi, Thrikkaripur, and along the Kavvayi backwaters, mussel farming is not just seasonal work. It is livelihood, heritage and, increasingly, big business.

This year, farmers have reason to celebrate.

With fish and chicken prices climbing sharply, mussels have become an affordable protein alternative. In river stretches like Balathiruthi, Cheriyathiruthi and Kottakkadavu, harvesting has begun in earnest. Farmers who seeded their ropes in October and November are now pulling up healthy clusters. A single box of seed can yield nearly ten boxes of mussels if weather conditions cooperate. This season, they largely have.

The mussels grown in the pale green waters of these rivers are especially prized for their plump meat and sweet, mineral-rich flavour. Harvesting is physically demanding. From morning until noon, farmers dive repeatedly into the river, prying mussels loose by hand. Once ashore, the shells are cleaned and sent to markets through agents.

Timing is everything. Once heavy summer rains arrive, salinity levels drop and yields suffer. In previous years, unseasonal rain and climate swings led to heavy losses. This time, farmers are racing to complete harvest before weather turns unpredictable.

A Ramadan favourite
The arrival of Ramadan has further boosted demand. Across Malabar, temporary evening food stalls pop up through the fasting month, and mussel dishes are among the most sought-after snacks. From fritters to stuffed delicacies and spicy pickles, kallummakkaya dominates iftar tables.

More than 2,000 farmers are involved in mussel cultivation in northern Kerala. Many are traditional inland fishers who shifted to aquaculture after repeated setbacks in river fishing, especially following the 2004 tsunami and subsequent environmental disruptions. Women’s self-help groups and small collectives also play a major role in farming and processing.

For many families in panchayats such as Padanna, Valiyaparamba, Cheruvathur and Thrikkaripur, mussel farming is the primary source of income. Subsidy support has been inconsistent, though Thrikkaripur panchayat recently allocated ₹5,000 per farmer to encourage cultivation. Farmers hope other local bodies will follow.

What does kallummakkaya taste like?
If you have never eaten green mussels, imagine something between clams and oysters, but firmer and more substantial. Kerala’s version is typically cooked with robust spices such as chilli, turmeric, black pepper, shallots, curry leaves and coconut. The meat holds up beautifully to heat and masala.

Unlike delicate European mussel preparations simmered in wine, Malabar cooking treats mussels boldly. They are steamed, fried, stuffed, minced and even turned into pickles.

And yes, they are worth building a bazaar around.

Here is a recipe to try out:

Malabar-style mussel fry (kallummakkaya varattiyathu)
This is one of the most popular ways to eat mussels in North Kerala. It is spicy, aromatic and perfect as a starter or side dish.

Ingredients
1 kg fresh green mussels, cleaned and meat removed from shells
2 tablespoons coconut oil
1 cup finely sliced shallots
1 tablespoon ginger-garlic paste
2 green chillies, slit
1 teaspoon turmeric powder
2 teaspoons red chilli powder
1 teaspoon black pepper powder
1 teaspoon coriander powder
½ teaspoon garam masala

A handful of curry leaves
Salt to taste
2 tablespoons grated coconut, optional
A squeeze of lime

Cleaning the mussels
If buying whole mussels, scrub the shells thoroughly and steam them in a covered pot for 5 to 7 minutes until they open. Remove the meat and discard any unopened shells. Rinse the meat gently to remove grit.

Preparation
Heat coconut oil in a wide pan
Add shallots and sauté until soft and lightly golden
Stir in ginger-garlic paste and green chillies
Cook until the raw smell disappears
Add turmeric, chilli powder, coriander powder and pepper
Stir briefly without burning the spices.

Add the mussel meat and salt. Mix well.

Cook on medium heat for 8 to 10 minutes, stirring occasionally, until the masala coats the mussels and the mixture turns slightly dry
Sprinkle garam masala and curry leaves
Add grated coconut if using and fry for another 2 minutes
Finish with a squeeze of lime.

Serve hot with rice, Kerala parotta or as part of a larger seafood spread.

In North Kerala, this is not just food. It is season, economy and identity, all packed inside a shell.