The same lagoon crabs go into odiyal kool, a fiery Jaffna seafood broth thickened with flour ground from dried palmyrah root sprouts.
Whole lagoon crabs are broken into shell-on pieces and cooked down in a thick, deep-red gravy of roasted Jaffna curry powder, coconut milk, tamarind and curry leaves. It's a signature of Jaffna's eateries and home kitchens, eaten by hand with rice or string hoppers.